Hi footballer62,
You obviously have something which is killing AV programs. You could try a AV scanner which doesn’t need installing, like Trend Micro Sysclean or DrWeb CureIT. You can download these on another computer then run them on the infected computer, preferably in safe mode. (If you can’t see the CD drive in safe mode, copy the necessary file/folder to you HD, then reboot into safe mode and run the programs.)
DrWeb CureIT is a simple executable, but Sysclean requires you to unpack some folders and move the actual executable to this folder.)
http://www.geocities.com/dontsurfinthenude/antivir2.htm