"Hi there, I'm experiencing slow performance on my PC. I think it might be due to some software I have installed. Could you help me identify and potentially remove any programs that are causing the slowdown?" If you know specific software that might be the culprit, you can also add: "I suspect that [software name] might be contributing to the problem." Be ready to provide additional information like: When did the slowdowns start? What specific actions make the PC slow? Have you recently installed any new software or hardware? The more details you can give, the better equipped the technician will be to help you.