I have lately corrected a problem with a Sony program(F4IRootkit--as it is called) that effectively neutralized my CD ROM drives, which a Malware Forum staff member and I corrected---returning control of the CD ROM drives and correcting Internet issues--potential threats as a result of the Sony program. I do however notice that my computer is slower in response time (not dinosaur-era slow, but slower nonetheless), and that there are seemingly more and more encounters with errors and sudden freezing for a reasons that I can't understand. Even when I enact Control-Alt.-Delete to get the Task Manager to see what is not responsing, there is no response. And I often encounter problems with programs or files on the desktop not responsing, which when I choose to end unresponsive operation with the Task Manager, the entire screen changes. The changes I speak of are: all the icons on the desktop disappear, and the Task Bar is also gone----the desktop background remains the same. There is response to the Con.-Alt.-Delete, with the Task Manager popping up, but thats the only response. The only other seemingly slow characteristic I can think of at the moment is that it takes forever to get the computer to restart or shutdown. The Malware Forum staff member was of great help to me and he told me my PC was free of Malware---which I free confident with his conclusion. I don't know if anything I described has anything to do with registry corruption or to do with the Hardware...forum. I've only had this computer(XP) for only five monthes, and that I haven't had these problems until lately. If this is in fact the usual characteristics of registry corruption, I believe by the described details I may also have a Windows 2000 registry corruption, but this point I just want help to correct my XP computer----I can get to correcting Windows2000 later. Any help anyone can give would be appreciated. Thanks in advance.