I think it's the remains of tuneup pro files that keeps harassing you. Try show all hidden files, as it may set its files as invisible to protect itself (you can hide all system files afterwards), search for its folder and files in program files. Then, back up registry files, use the Find function in registry editor to find items of tuneup pro, and delete them all. That's what I usually do when I notice some rubbish comes inside. Also, check DNS settings, proxy settings and hosts file, this vicious thing may change that, too. This will surely help:get rid of tuneup pro ads