In my Honest Opinion this is what I see. Computer slow+Kids downloading Music=computer more than likely corrupted with lots and lots of malware. It comes with the free music downloads. Disk cleanup is a good move, but you have to do a thorough check for Viruses, spyware, Trojans, not only in the HDD but also in the Registry. Invest in Registry First Aid. Check for unwelcome BHO's. After cleaning out all the rubbish, defrag HDD. It is also possible to defrag Registry. A lot of patience and work ahead of you. Children downloading free music ruins more computers than all the browsing I could ever do. Get a Mac for the kids and leave the PC for the adults.