Question : Blue Screen shortly after Vista loads

I don't have the vista cd so I can't use the startup repair tool... what should I do?

An AVG virus scan from Safe Mode doesn't find anything.

It happened today while browsing the internet, and now it happens (Blue Screen) every time Windows starts (shortly after the desktop loads).

If this has happened to you in the past couple of months, or you know of similar cases from the past couple of months, and you have any ideas or remember anything that might help... well... thanks.

Answer : Blue Screen shortly after Vista loads

Enabled again?
Its possible that ram is faulty>I havn't seen a Vista system with 256mb(wouldn't respond much).

Check the physical ram chips. Size should be on them