serious problem

[jeff]

ok, here goes...

I was working in photoshop and my computer froze (as it often does because I'm low on RAM). After re-starting my computer I attempted to go into the folder where the file was and when I clicked on the folder my computer screen flashed and wouldnt open the folder. I found this extremely strange, as I'm pretty computer-saavy and have never seen that before.

I managed to move the file in question out of the folder and onto the desktop, which turned out to be HUGE mistake, as now my entire desktop & start menu flashed, and now wont appear at all, even after I've restarted numerous times.

Basically the photoshop file must be massively corrupted and I need to delete it, but I'm unable to, as each time I restart Windows only appears for literally a second (not long enough for me to delete the file). I tried accessing the desktop through a drop-down menu in Windows Task Manager as well, and again, it wont only give me access to the Desktop for a second at the most before flashing and disappearing.

I realize the obvious answer is that I have a virus but I have the latest version of AVG and it's not picking up anything.

So um...HELP! any ideas??

thanks in advance.