Have a cpu that was infected with several pieces of malware and adware and such. Everytime I tried to open or run applications I got the Microsoft has encountered a problem message. So I finally decided not to waste time, went ahead and backed up all important files customer needed and reformatted this Dell Dimemsion 3000 with the origional XP Home disk it came with. BTW I did a full format not quick one. Everything went fine, XP booted up. Looked in control panel, system, device drives and the only ones missing were the ethernet controller, modem, video and audio drivers. From this cpu went on dells site found the proper ethernet driver, saved it to my flash, transfered to desktop of the Dell, double clicked...nothing happened ... right clicked the tried open and run .. nothing ... tried the same with the video and modem same thing nothing happened. Tried to install ccleaner and got the microsoft has encountered a problem message again .. tried to install hijackthis and same type of message. figured something went wrong during install so i used a OEM copy of xp pro i have used on several machines without any problems including mine so I know it it good. Put it in the dell and restarted .. did another full format on the c: partition(only one) .. install went off without any problems. XP Pro restarts and I still have the same issues. Decided to try another format to bring it back to customers origional operation system and the issues are still present. Have never encountered a system problem like this after fresh installs. I have also tried the exefix from kellys page but no help. Friend suggested it might be some sort of file association problem but I cant seem to find one or dont know what Im looking for. Any help would be greatly appreciated. Thanks in advance.