Erroneous memory references point towards virus/software.
[Check the RAM]
Download and Run Memtest86 http://www.memtest.org/
and let it run (it will take much time)
If your memory passes, congratulations you most likely have a virus or other malware.
[Do Virus and Spy Ware Scans]
I like Microsoft Security Essentials and SpyBot Search and Destroy (both free)
[Remove the Virus]
Removing a well written virus is not fun when it takes over...
AVG, Avira, BitDefender, F-Secure, Kaspersky, Panda, and PCTools all put out free Recovery CDs you can boot-up and run.
Tip: If you have a large (couple GB) flash drive you can use a tool like xboot to install the iso's to your flash drive to boot from.
BACKUP YOUR FLASH DRIVE FIRST, IT WILL FORMAT IT!!!!!!