I've got an issue with Windows 7 rebooting when running chkdsk during startup. It doesn't give any error message or anything like that. It just reboots. Sometimes instantly (even before the check actually starts), and sometimes in the middle, and sometimes in the end. Running chkdsk in Windows 7 from the command prompt give me no errors, and it completes in no time. Sometimes, chkdsk during startup completes without errors, but it takes insanely long time.
I just discovered I've been running my Windows 7 64-bit system with 1 defective memory unit. That unit is now removed, and I'm running with a single one now instead of two (2GB instead of 4GB). A thought I had was that maybe, because of the defective memory, some data on my SSD harddrive has been corrupted.
Also, it seems like Windows 7 wants me to run chkdsk every time I start my computer.
So I decided to reinstall Windows 7. Didn't work the first time, it would just continue restarting. I had formatted the harddrive using Windows 7 setup, but I think that only was a quick format. So I formatted it completely NTFS using another installation. Then I installed Windows 7 and it hasn't behaved oddly ever since.
Also, I changed in bios settings the SATA mode to AHCI instead of IDE before the Windows 7 installation.