Windows 7 reboots when trying to log in

One of our laptops is running Windows 7 Professional (upgraded from the Home edition using the Windows Anytime upgrade). It is the 64 bit version.

Today upon booting the machine something strange happens - it boots to the logon screen (Press CTRL + ALT + DELETE to log on). It then asks for the password, however it then reboots after around 15 seconds. If you enter a password befor the 15 seconds have elapsed, it won't let you enter it (the characters appear in the box, but pressing Enter or clicking on the arrow does nothing).

It works in Safe Mode - any ideas how to resolve this?
Jim JonesAsked:
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LeeTutorretiredCommented:
Have you tried booting from your Win7 DVD and running Startup Repair:

http://www.sevenforums.com/tutorials/681-startup-repair.html
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Jim JonesAuthor Commented:
Tried startup repair, but it couldn't find anything it could fix.

Managed to log on once, then a window popped up saying that Windows would restart in one minute (and it did). Sounds like a virus, but i've disabled all startup services and programs and antivirus software is installed.
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LeeTutorretiredCommented:
That "shutdown in one minute" sounds like another question I've just recently put a comment in:

http://social.answers.microsoft.com/Forums/en-US/vistaprograms/thread/7346f21d-e518-4c01-a55a-58948b71d0d4
windows is auto shutting down

You might want to do a more thorough virus check, as recommended in the page above.
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Jim JonesAuthor Commented:
I used MalwareBytes with the latest definitions as well as ESET NOD32 with latest definitions, both found nothing. The shutdown -a command also doesn't work - it says "shutdown in progress (1115).

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LeeTutorretiredCommented:
If it works in safe mode, it may be because of some conflict caused by startup programs (which do not run in Safe mode) or some driver that is not used in safe mode.  In Windows 98/ME/XP/Vista/Windows 7, you can choose which programs are run at startup by using the Microsoft Configuration utility:  click on the Start button, choose Run, type in MSCONFIG (doesn't need to be all capitals), click OK.  Choose the Startup tab, deselect programs to run at startup by removing the check mark.  In Windows 9x/ME, you may need to disable just about everything except Explorer, ScanRegistry and SysTray.  In Windows XP/Vista/Windows 7, just click on the button for Disable All. Reboot and see if the problem goes away.  If it does then re-enable the startup programs one (or a few) at a time, reboot, and when the problem occurs again, there is your culprit.  If you have a great number of apps to narrow down on in trying to track down the culprit, do it instead by dividing up the loading programs into successively smaller halves:  disable half of them; if the problem doesn't go away, then the offending app is within the other half, so divide that group into half; or if the problem does go away, then the disabled group contains the offender, so again narrow down by dividing in half.
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Jim JonesAuthor Commented:
I tried disabling all startup programs and non-microsoft services and it still failed - although now it would let me log in it would give an error saying Windows would shut down in 1 minute. Aborting the shutdown was not possible. Scanned with latest antivirus and malware software (NOD32 and Malwarebytes) and nothing was found. Ended up reinstalling. Very annoying though...
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Jim JonesAuthor Commented:
Reinstalling did solve the problem, so i'll accept my own solution. However, if anyone knows why this happened for future reference please comment on here.
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Windows 7

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