SFC /SCANNOW access

Laptop with XP Pro.  I'm suspicious that some of the OS files are corrupt.  I would like to run SFC to check them but even with Admin control of the user account, I cannot seem to access this function.  I do not have an admin password for the plain admin account.  Is there a way to do this via the CD with XP Pro/SP3?  I tried a repair but in doing so I got to the option for "recovery" which simply gave me a C:\Windows prompt.  SFC is not a command line option or at least not to my knowledge.  

Basically, the question is..."how can I check the validity of the XP Pro system files?"  This all got started because I am unable to install XP updates.  Fifty Seven updates show as available but when attempting to install,  I get an unable to install update error.  Some detail behind this seems to vary each time I do another attempt at updating.  For example, one of the detail errors is 0X80070057.  Another is "cryptographic services are not registered" or something similar.  BTW....when trying to install a single XP update, it appears to install OK.
tonyadamRetiredAsked:
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web_trackerComputer Service TechnicianCommented:
The sfc command can be run when you boot into windows  by running the command prompt as an adminstrator. Click start button, go to all programs, click accessories, and right click on command prompt and choose run as,.,, choose the following user:  administrator then type in the administrator password, if you never setup administrator password it may be blank. (Note: if an administrator account was created you may need to use the dropdown arrow to select the right administrator you created for this pc and then enter the administrator's password) Then press okay you should now have the dos prompt with admin rights. Now you should be able to run the sfc  command.
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web_trackerComputer Service TechnicianCommented:
To fix a windows update problem you may just need to run the update fix for windows xp.  http://support.microsoft.com/mats/windows_update/

This other website may help as well: http://support.microsoft.com/kb/971058
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nobusCommented:
here an article explaining sfc use in detail  :  http://www.updatexp.com/scannow-sfc.html
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tonyadamRetiredAuthor Commented:
I'm in the process of running SFC now.  However, I wanted to get back to web_tracker that doing the MS FixIt did not help.  Here are the error messages when attempting to do the updates.  BTW...54 updates show as needed to be installed.  They simply fail almost immediately upon requesting the install.  

The errors that FixIt did not resolve:
1.  "Windows Update error 0X80070057"
2.  "Problems installing recent updates" - this shows 3 times as an error in the list
3.  "Cryptographic services components are not registered"
4.  "Check for missing or corrupt files" - this was checked as OK for several lines in the list.

Hope this helps to help me resolve this.
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tonyadamRetiredAuthor Commented:
The problem is solved.  I was able to look at the windows update log and found the fatal error which had to do with BITS.  It was not a part of services.  After a lot of searching on the web, I found a site that shows how to successfully get it installed and registered.  All is well.  Updates are now downloading and installing.  Thanks for you responses.
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nobusCommented:
Glad to hear all is ok now - did running sfc help?
don't forget to close this if no more help is needed
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tonyadamRetiredAuthor Commented:
Sorry, SFC did not help.  Will close the question.
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tonyadamRetiredAuthor Commented:
Additional research on the web helped me find the solution to the BITS problem.
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