Last upgrade I got for this PC was RAM but that was a long time ago, September I believe.

The instruction at "0x745f2780" referenced momory at "0x000000000".The memory could not be read.

Press OK to terminate the program.

Press Cancel to Debug the program.

That's the message I get after a few minutes on my computer. After the message everything goes 3 times as slow my computer heats up 10 degrees celcius in few seconds, my sound dies half the time and my WinXP Windows turn into Win98 style Windows. I reinstalled windows but after few days it came back. I always press Cancel if I press OK my PC freezes and needs to be restarted. Help this is annoying. I think this is a virus.