Boot, Automatic Restart Don't Work

Some weeks ago my desktop (Windows 7 Home Premium 32bit) started crashing sometimes, mostly when I put it into suspend mode. It could generally be restarted by powering up again, sometimes a couple of times. I didn't do anything unusual at the time such as major new hardware or programs.Now the problem is systematic and I can't really boot anymore in normal mode. Windows 7 hangs on the screen with the four-colored animated window early in the process.I've tried: * The auto-repair option when booting. This reports an error for which no solution is known:

StartupRepairOffline
1 6.1.7600.16385
2 same number
3 unknown

[code]...

* The repair tools on my Windows 7 installation disc. Again no joy.

* Re-installing Windows 7. I did this as an "upgrade", not as a completely fresh install, as I couldn't face re-installing programs and getting user data off and on. The re-install itself did seem to finish. But every time the computer had to be restarted it would freeze. I then turned it off and on manually, and it continued as expected.

* sfc /scannow

* Memory test

* Booting with a protocol file (F8, ntbtlog.txt).

* Fixing the master boot record.

I've not tried restoring to my only system image (9 months old), as I thought this cannot be better than re-installing Windows 7 while keeping the programs and user data ("upgrade"). I did make a Windows Easy Transfer copy of the user files one time when I managed to boot for some reason, so I'm not violently opposed to trying this if there's a good reason.I can start in safe mode. I think the attached protocol file shows two boots: First a regular one which fails, and then a safe mode which doesn't load a lot of stuff but which succeeds. In the first, regular boot there are a couple of drivers that don't load.