BSOD and repair not working

Seems as of recently I've had alot of BSOD, I can't get my computer to boot half the time and usually during a windows update it's like a game of poker with it trying to get it to start.
I run the startup repair and get nothing, it doesn't even work.
I try in safe mode or some boot mode to try to get in but nada always BSOD.

After about 20 times of trying to restart right as I get in this forum on my husbands computer it decides to "start" with an update.
I just don't understand why it's been doing it. Every wed my computer defrags and runs scans for viruses I use avast and also have avg sometimes running.
Half the time the updates don't even update either.
I have Vista.
I would post an error message but can't get to it at the moment.
 
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