Turn off your error reporting. start\control
panel\system\advanced tab\error reporting button in the bottom right.
OM
This will remove the error mesage, now I would suggest you may have a bad hard disk or even a virus/trojan.
First things first: Run an AV scan (try AVG Free edition if you don't have an AntiVirus scanner)
http://www.grisoft.com
Scan for ads and spyware:
AdAware free: http://www.lavasoft.nu (a handy utility regardless)
Next you can try simple solutions such as ScanDisk, disk cleanup and defragment from START>PROGRAMS>ACCESSORIES>SYSTEM TOOLS
lastly check yuor harddrive.
Online if you have a S.M.A.R.T. drive:
http://www.belarc.com/harddrives.html
If you have another drive, there are actually many disk check utilities such as Drive Helth, Emsa disk check, and HD workbench just to name a few. You can find disk utilities by searching portals like ZDNET or CNET downloads, this link also has some utilities you can try. http://tinyurl.com/ywhyu
Good luck, post back if you get stuck.
OM