So ive been having some issues with my computer. It started about 2 days ago, i was surfing the web and i got hit. my computer started spamming pop ups and my icons and start bar dissapeared. since i have ran vs several times. i keep getting 2 trojans in C:\ WINDOWS\system32\mljGaaya.dll and C:\ system32\lsass.exe (820) My vs can not delete these and i have tried manually to remove them and get Access denied. Im running AVG anti-Virus
and its on xp media center edition. each time it boots up, it runs fine till everything is loaded, then my icons and start bar dissapear, so it is not an issue with them not being there at all, they dissapear after everything is loaded up.

Thank you for any help you can offer.