have you made sure that your system is free from viruses and malware?
try going to start>run>eventvwr.msc>Applications and look in the right pane for errors related to explorer.exe
do they report any specific dll for faulting module?

No errors in the eventviewer

Actually I found two errors. see attached.
Could you tell about them?
Errors-in-Event-Viewer.JPG

You may well have a virus or Malware as already intimated.  Suggest you run Trend HijackThis 2.02:
http://majorgeeks.com/Trend_Micro_HijackThis_d5554.html

The technique is to create a folder where you would like the HijackThis file to reside, and run it from there, not from the Desktop or a temporary folder.
Run the scan & save the logfile.  Then click the "Attach File" box, paste the logfile into the "Add File" page & there we can analyse it.  

This previous thread may also be useful>
"Runtime Error With Windows XP":
https://www.experts-exchange.com/questions/23198014/Runtime-Error-With-Windows-XP.html

Ok I done HijackThis. See log file
hijackthis.log

fcirillo,
For reasons unknown at present, something appears to be preventing me from analysing your logfile!  
I've tried with another logfile & it worked ok.

As an alternative HijackThis site, you could try downloading this different HijackThis file.  Do another scan and i'll re-attempt to analyse the logfile.  Thanks>
http://danborg.org/spy/hjt/alternativ.exe

Have re-tried to read your logfile but still no good.  
If you are unable to download HJT from the "danborg" site, try the earlier "majorgeeks" site.

Meanwhile i took a look at your first event Viewer error (requested by SheharyaarSaahil), and found information on the GbpSv entry >

GbpSv.exe is a component of the G-Burster Browser Defense. It is used by many banks in Europe to offer secure online banking. It is reported that this process may prevent computer from properly shutting down when used with IE7.
Details>
http://www.spyany.com/files/gbpsv_exe.html

See if this helps>

"Error: Microsoft Visual C++ Runtime Library Runtime Error when opening AVI files":
https://www.experts-exchange.com/questions/23342231/Error-Microsoft-Visual-C-Runtime-Library-Runtime-Error-when-opening-AVI-files.html

PLease find attached new log file got from danborg web site
hijackthis-24-06-08.log

I am attaching again with the termination .txt
Seems now is OK
hijackthis-24-06-08.txt

Have now tried to get *both* your HijackThis logfiles analysed on a popular website, using my two different computers, a Windows Me and an XP, but in both cases i am unable to do so.  Have not experienced this effect before.

Incidently i presume you are using a Firewall and if yes, have you got it disabled?

Meanwhile, may i suggest you run the following Kaspersky free online virus scanner, which is a good way to find out if you have any viruses or spyware without having to uninstall your existing antivirus software>
http://www.kaspersky.co.uk/virusscanner

Also run this excellent Malware scanner Superantispyware:                        
http://www.superantispyware.com/

Then if either scanner finds(or removes) anything, we can have another attempt at running HijackThis.

I hope it works now
hijackthis.log

Sorry, have double checked but still getting the same results.
Only thing obvious was the "End of File" is missing from your logfile, but i cannot see how that's the cause!

Is it convenient to re-establish your Firewall but temporarily disable your McAfee Antivirus, with your internet connection disconnected of course?

Have to power down my computers for ~ 3 hours due to a major planned power outage in the area, with associated power interupts.

If your HijackThis analysis is really urgent, you could consider asking a new question in the HijackThis TA>
https://www.experts-exchange.com/Software/Internet_Email/Spy_Ad_Blockers/HijackThis/

Whatever you decide, i'll definitely drop by later.

Now back on line ..
Incidently a more efficient method of asking a question in the HijackThis TA (only *if* you later wish for additional advice on the logfile) would be to post a "Pointer" question(worth 20 points) with a link to this thread number http:Q_23507006.html.  This will give you an immediate input from experts active in that other zone.

Haven't forgotten you, but i've investigated further & re-attempted to analyse your logfile.  Regret still unable to do so!  
Have used other HJT logfiles this morning, no problem.  It's almost as if your file is somehow incomplete and is not being recognised by this site>
http://www.hijackthis.de/

Normally you get a return recommendation from this site, which you thoroughly inspect, & hopefully come to a conclusion about which item(s) should be 'Fixed' .. but it's not working with your log.

May i therefore suggest that you run Process Explorer version 11.13:
http://www.microsoft.com/technet/sysinternals/ProcessesAndThreads/ProcessExplorer.mspx

See if you have high CPU usage!   If yes, double click the problematic exe, select the Services Tab, and see what services are in that exe file.    Is it a svchost.exe file?    
If you're getting interupts then conceivably you have a driver or hardware problem.

Incidently did you run Kaspersky?