Don't buy this junk. I am deleting it from my computer. I can scan, it finds "problems" and supposedly fixes them. I rescan ( having done nothing on my PC except re-launch Reg Servo), and I get more errors. I can go thru this process a hundred times. I don't think this s/w does anything. They wanted to get inside my computer last night, and I was too tired to proceed. Now, after having read these reviews, I am glad they didn't.