Windows 7 PC reboots when trying either logoff or switch user

Hi - Have a Windows 7 PC, Dell Inspiron 1545 Desktop, that whenever we try to either switch user, or just log off, it automatically reboots. There is no error message, and doesnt appear to be any blue screen. I though we may be dealing with a video driver problem, but i updated that, and still the same thing. Any ideas?
hodgemAsked:
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JohnBusiness Consultant (Owner)Commented:
Open Control Panel -> Action Center -> Maintenance -> View Reliability History and see if any errors show up there that you can check.

Otherwise, in a well-working Windows 7 system that does not happen.

Check that Dell drivers are fully up-to-date and that Windows is fully up-to-date. If Office is installed, update it. Still a problem? Look for legacy software that was installed but not fully compatible with Windows 7 (of which there is lots of such stuff).  Then take a serious look for malware and other rootkit type viruses.
... Thinkpads_User
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ashishkpandeyCommented:
It seems that the user profile is corrupted. Please rename the User profile and then log on . It will create a new user profile.

To rename any profile you have to log in as administrator and then only you will be able to rename the profile. If you logged in as self and try to rename your own profile, it will not rename it as the profile is currently being used.
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JohnBusiness Consultant (Owner)Commented:
Thanks, and I was pleased to assist. ... Thinkpads_User
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