I am trying to fix my friend's Toshiba QX411. The computer freezes whenever you try to open ANYTHING. I have already tried to defrag his HDD on several occasions but, like I said, it freezes whenever you try to do anything. I got so tired of it that i just completely formatted his HDD. After that didn't work, I formatted it again, and yet again it still ceases to work. I checked his RAM connections ( he has 6 GB) and they are all fine. Any suggestions?