Hardware malfunction

I am getting an error on a blue screen now when I log into my computer the error message says Hardware Malfunction call ur harware vendor for support NMI: Party Check/Memory parity error system halted. 

It all started with a virus.  I installed spybot and did a virus scan, it picked up the problems and fixed all but three.  After that when I logged in I would get a blank screen and my desktop was gone but I always got a windows configuration error.

Then I decided to use my recovery disk so I tapped f8 at the Bios menu and was going to choose boot from cd however that was not an option.  Then I tried going to the Bios menu and adding that in my boot sequence.  Didn't work because now I log in to windows and it shows my screen saver then says logging out and takes me to the blue screen with the above Hardware malfunction error.

Now what do I have to do?