Can't understand it. I have installed 7 again after I had a virus, and just thought "Hell, may as well put 7 on now"
So complete removal of Vista (may not have been a virus, may just be an irritant) and put 7 on.
Only, it takes an AGE to shut down. I kid you not. Ranging between 5 and 10 minutes. And the twice it went that long, it ended with a BSOD.
AND...this morning it wouldn't boot up, nor repair, and I had to go for a system restore losing most of the stuff I had put back on which was necessary.