Catastrophic

. I also have several updates that fail and will not install. (KB941569, KB941569, KB942615, KB942624, KB943078, KB938123, KB938979. Can anyone help me?<< is this windows updates  if you were installing all these updates manually  you may have damaged your system, windows updates must be carefully checked to match the dates,, if installed incorrectly will damage the OS,
Please provide the OS version
XP  home /  pro
Media Center version
 manufacture and type PC laptop/ desktop
then I'll know  which course of repair to offer.
 For now try the system restore.

You can try this on also! If you have System Restore enabled do following:
1. Select Start button, point to All Programs, point to Accessories, point to System Tools, and then click System Restore. System Restore starts.
2.On the Welcome to System Restore page, click Restore my computer to an earlier time (if it is not already selected), and then click Next.
4. On the Select a Restore Point page, click the most recent system checkpoint in the On this list,(pick a day witch you know the system worked OK) click a restore point list, and then click Next. A System Restore message may appear that lists configuration changes that System Restore will make. Click OK.
5. On the Confirm Restore Point Selection page, click Next. System Restore restores the previous Windows XP configuration, and then restarts the computer.
6. Log on to the computer as Administrator. The System Restore Restoration Complete page appears.  
7. Click OK.
More in from: http://support.microsoft.com/kb/306084/en-us
After this do virusscan and defrag your harddisk. Yous syste shoud work now!

Thanks for details TapioL I did suggest system restore without the details :)

What is your situation ,still no go? Other defrag to use is pagedefrag from Microsoft(org. Sysinternals) try to run that one also, if that would help!

How experienced are you?
How many files do you wish to keep?
If you are not confident dont do this take your computer to a prefessional

If it is not malfunctioning hardware. ie the hard drive is dying, space problems on the disc.
 or the cmos battery is nearly out of power, everytime you boot windows forgets things.
replace the cmos battery if your system is more than 4 years old.

Disconnect from the internet when running scans, run them in safemode and remove any external devices.
If your virus scans come up clean in safemode. Do you have a slaved HDD on there it maybe faulty. Unpug it.
You can stop the rebooting by disabling the restart
in safemode
r/click my computer properties advanced startup and recovery
untick automatically restart
you should get a bluescreen now..
whats the error

Check the boot.ini sometimes the boot.ini is changed
r/click my computer properties advanced startup and recovery edit, be very careful what you do here.
here is my boot.ini
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect

 DISCONNECT from the INTERNET

if you installed xpsp2 onto xpsp1  uninstall sp2 from add remove programs.

You have basically 4 choices now,
--------------
1- slave it
 take out the hdd and slave it to another system, desktop, if you have a desktop, laptop hdd are harder to slave,
you can slave it using the ide ribbon behind the cdrom if your rom is on the slave ribbon not behind the master hdd.
 If you choose to do this ensure you power off completely on both desktops pull the power out and wait 5 minutes, if you discharge any electricity you will kill the HDD not to mention other majour damage.
Dont stand on carpet helps
once you have removed the HDD,
Move the pin to slave, there is a diagram on top of the hdd.
slaving the hdd allows you access to the drive from the other dekstop windows as it nolonger uses windows, you can run full virus scans on the hard drive from here first then save off your files.
-----------------------------
2-run a chkdsk /r from recovery<< you need the setup disc ie xpsp2 not the single xps2 upgrade.
press del when post starts, set the bios to boot from cd first boot, put the xpcd full sp2 in the rom f10 to save and exit
reboot
press any key to start setup.
At the next screen press "R" to repair using the Recovery Console.
Press the number correlated with the Windows installation you want to fix.
 Typically this will be #1.
 In the Administrator password press [ENTER] if you have not set a password for it.
At the command promt type in chkdsk /r  then wait
once it has comppleted it will return you the CMD prompt a fsalsing curser,, take out the xpcd now
type in exit pres [ENTER] windows will reboot, tap F8 then choose start my computer from last known good config that worked. [ENTER]
it will reboot into windows.
--------------------------------------------------
2-Run a repair re-install, for xp home sp2 and xp pro sp2,
NOTE: its very important that you never run a repair from recovery for XP HOMEsp2

Perform a reinstallation of Windows XP, sometimes called a repair installation?
You will need the COA key on the sticker and the xp setup disc that is installed on the computer
Configure your computer to start from the CD-ROM drive. Then insert your Windows XP Setup CD, and restart your computer.
When the Press any key to boot from CD message is displayed on your screen, press a key to start your computer from the Windows XP CD.

 Press ENTER when you see the message:
 To setup Windows XP now, and then press ENTER displayed on the Welcome to Setup screen.
 
 [[  Do not choose the option to press R to use the Recovery Console. ]]
 
In the Windows XP Licensing Agreement, press F8 to agree to the license agreement.
 Make sure that your current installation of Windows XP is selected in the box, and then press R to repair Windows XP.
 Follow the instructions on the screen to complete Setup.
NOTE:
you will not lose your persoanl you will need to run the updates.

Here is some extra help illustrating the steps look below the typing.
http://www.webtree.ca/windowsxp/repair_xp.htm
http://www.theeldergeek.com/repairing_windows_xp.htm    
-------------------------------------------------
all the best

Just to add the Lsass.exe  is a worm that will reboot your system
are you seeing any messages
your windows is shutting in down in 60 secs?
Mcfee instructions included
http://vil.nai.com/vil/content/v_125007.htm

Stinger is a stand-alone utility used to detect and remove specific viruses when AC is disabled
stinger
http://vil.nai.com/vil/stinger/

Now that you rolled back to the 19th, can you run programs?

Can you run Hijackthis and show us the log please?
http://www.trendsecure.com/portal/en-US/tools/security_tools/hijackthis
http://danborg.org/spy/hjt/alternativ.exe
Open Hijackthis, click "Do a system scan and save a logfile" please don't fix anything yet.


Also run Kaspersky's online scanner, it will not remove anything it finds but it should give us info if we're dealing with a file infector or not.
Using Internet Explorer, run Kaspersky Online Scanner
http://www.kaspersky.com/virusscanner
   
* Click 'Accept' in the window that pops up.
* You will be prompted to install an ActiveX component from Kaspersky, Click on the information bar and select Install ActiveX Control if so. This may happen more than once. That is OK. You also may get a warning from your Windows Firewall. You can tell it to unblock.
* The program will launch and then start to download the latest definition files.
* Once the scanner is installed and the definitions downloaded, click 'Next'.
* Now click on 'Scan Settings'
* In the scan settings make sure that the following are selected:
          o Scan using the following Anti-Virus database: 'Extended' (If available, otherwise 'Standard')
          o Scan Options: 'Scan Archives' and 'Scan Mail Bases'
* Click 'OK'
* Now under 'Select a target to scan' select 'My Computer'
* The scan will take a while, so be patient and let it run. Once the scan is complete, it will display whether your system has been infected.
* Now click on the 'Save Report As...' button:
* Make sure it says Save as a text file - change it if not
* Save the file to your desktop.

Hi Devilleman
results doesnt show any real  problems your analysed log
http://www.hijackthis.de/logfiles/1137fd4ba2efd3f0a446e07886320714.html

a few miscelainous not needed.

[?] - j:\6be9d412be161e01509a414f\ZuneSetup.exe
[N] - O2 - BHO: MSVPS System - {283A0EE3-2CC1-45AB-8207-B1D7B69C7F83} - (no file)
[N] - O9 - Extra button: CoolIris Preferences - {449DB14A-F988-4fd8-9361-F212D7B6414B} - (no file)
[N] - O9 - Extra 'Tools' menuitem: CoolIris Preferences - {449DB14A-F988-4fd8-9361-F212D7B6414B} - (no file)
[?] - O21 - SSODL: wmpenv - {EE8ED5AF-15F2-4F72-BD21-DF6997F7FCD7} - (no file)
[?] - O21 - SSODL: wmpconf - {411A02BF-47DF-4C38-95A9-436B79881C12} - (no file)
[?] - O23 - Service: McAfee Application Installer Cleanup (0095751199259546) (0095751199259546mcinstcleanup) - McAfee, Inc. - C:\Windows\TEMP\009575~1.EXE

I believe your problem is not malware but an OS problem, please answer any questions already asked about what you did recently.
I gave you a comprehensive list of things to peform so far you have not responded to any these.

I still cannot view pictures and videos in the media center. It keeps shutting down. << maybe a video card problem.

You did have a malware infection there at some point, those dead "no file" entries in 02 and 021 lines are a leftover SDBot and Smitfraud entries.
Those entries shouldn't be causing any problems now.

What other things have you tried doing to fix the problem, scanners etc?

fair eough its a funny tool but is quite simple, you install stinger first then download the latest patch so it uses that when running the scans, if it finds anything it will tell you if not it says nothing.
So I do believe there is no malware threats left on your system but often times after it is cleaned out some programs may not run the same.
I would recomend that you have a professioanl look at your computer  to save off your files and then repair the OS.
Repairing xp is not for the inexperienced when you have a lot you can lose.
You can slave your hdd and save off your files save the emails store folder etc.
This is what I recomend as I feel we have covered the best so far any further puts your system at risk.
All the best
Merete

Here´s one thing to try! Unistall Mcafee, and if you have ATI display adapter unistall it´s driver also!
After reboot reinstall ATI drivers manualy. Does the system work now?