i had this problem a couple weeks ago and all i done in the end was ;went in to C drive ,then down to windows folder,then down to prefetch and delete everything in there as its all crap,then down to temps folder and delete everything in there.then come out of the windows folder and click on USERS folder and go in to which ever forlder your compuer is named under mine is (MIKEY) then click on APPDATA ,then click on LOCAL,then click on TEMPS folder and delete everything in thereto. make sure you are (showing hiden folders,) and then empty ya recyle bin,then do a disk cleanup and a defeg,and i have not had it come back,PLUS it gives ya pc a good cleanup at same time ,,,,,,,,,,,,,,,,,,,,, I AM RUNING WINDOWS 7 64BIT,