Strange Restart or start or...,I don't what!!!

[saeidmscs]

Hi every one
When I open a folder which contains some "video files" including types of 3GP,WMv,etc,windows crashes and this message appears:
windows explorer has stopped working
and then:
windows is restarting
then,like loging off,system starts again,but there is only one differnce and that is other programs which aren't related to windows explorer(for example,softwares like adobe acrobat,MATLAB,...)
,after that,continue to work properly!!!:shockI mean windows doesn't log off completely,sth like logging off occures)
What's wrong here?
What should I do?
Cheers

 

[Antman]

...What's wrong here? What should I do?

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