It is unlikely that this symptom is the result of normal adding or removing of programs. I would imagine some sort of malware is the cause.I suggest a thorough scan with Spybot, Ewido and Ad-aware. After that try sfc/scannow from the run command, with your XP disk in your cd drive.
I am getting a message from my security software that the microsoft registry server is trying to reconfigure software by modifying the registry keys. I have tried denying it, I have tried allowing it, but the message won't go away. As a result, programs I try and use stop responding. I know not to mess with the registry, and I know that anytime you install and uninstall software, the registry is affected. What should I do?