Got answer so fast decided to send next question along. 1. Under more tools in Malewarebytes is a tool called File Assassian that says can help delete locked files.When would one want to run this,and what exactly are locked files.should I be messing with them. Reason I am asking is that my computer is running slower,and slower all the time.Kind of like that commercial. Also what about compressed old files there is 4,096KB of them on my C:drive.can you get rid of those? How do you find out what they are. I have XP SP2,(and yes I know I need to update before July,Thanks for that tip).Thanks for any help.