Windows Vista Home Basic
32 bit OS
Original OS
1.50 GB RAM

I cannot shut down windows Defender because that is the error code i get each time i try to open the application. And for antivirus i was going to use AVG. Or would u recommend i should use Security essentials?

Ok well i installed security essentials and then restarted it and got the same windows defender code so i planned on just uninstalling it, well i did kind of a dumb move and for some reason i just went to all programs and just deleted it from there but then it wasnt in the list of installed programs.. so i restarted and it is popping up that error code, plus it is opening a white window (i think its a window) and it fill the whole screen so you cant see the desktop or icons. i can start the task manager (by pressing ctl,alt,delete) and if i click the windows button on the computer i can get the start bar at the bottom to appear but it wont let me get rid of the white screen. And in task manager there is no programs running and no "odd" services that look out of the ordinary. Any ideas? thanks

I discovered that the "white screen" was a explorer window that was open and you couldnt close it. so i just went to my processes and ended explorer.exe then restarted it and it was gone any idea why it starts every time the computer is turned on though?

I got rid of the white screen and windows defender and restarted it a couple times and have had no problems. Thank you for all your help.