"CPU Usage: 100%?!?!" GAAAAAAHHHH!!!! I'VE HAD ENOUGH!!!

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(bangs head on the wall in severe frustration) This annoyance is starting to rise my blood pressure higher... For months, when I start up the computer and login to my account at home, I always press Ctrl+E to activate Windows Explorer so that I could see my files and use them, store them, and then delete them. Currently i'm trying to store most of my files to DVD+RW because my computer is starting to become full. Mind you that the OS i'm using is Windows XP Home Edition. Lately, when I pressed Ctrl+Alt+Delete for Windows Task Manager, and then Ctrl+E to start up Explorer, the friggin' thing slows down, and in the Task Manager, I see the message: "CPU Usage: 100%". I thought, "what the Hell?" I tried everything to stop this from happening, and I even used System Restore SEVERAL times, like in 3 days when this happens. I even had it restored on Sunday and it's wonky in 2 days. Add to the fact that my little health-sucking leech of a sister is frequently on it almost all day and night and I can't store my files as long as I used to, my computer's getting worse and worse. Long story short, every time I activate Windows Explorer, I get computer slowdowns, it's almost becoming unresponsive, and it says "CPU Usage: 100%". This kind of annoyance is stressing me out big time and I have a lot of files needed to be stored in my DVD+RW discs. I've ran "Disk Cleaner" (a program that cleans out the computer to make it run faster except for the My Documents folder) and "Diskeeper" (a very good disk defragmentation program) on occasion, but it's still not enough. Is there a way to put an end to this virtual nuisance once and for all??