HP Compaq 6715b Suddenly Slow and CPU Usage is at 100%

Hello,

I have a HP Compaq 6715b and after I scanned it with AVG8 AntiVirus it has been very slow, It takes around 5-10 Minutes just to get past the WindowsXP Screen (loading Windows) and it is slow once windows loads, my CPU usage is almost always at 100%, I tried Virus Scanning, I defragged (it is at 0.21 percent fragmented) I ran TuneUp 2008, I tried even creating a new user and it did not help much, I went into Device Manager and there is a IDE Controller that has a problem and Windows won't fix it, the first time it was called "AO4NNG2Z IDE Controller" and after I uninstalled it and hit "Check For Hardware Changes" it brings the IDE Controller up and it is called "AO8FIO4J IDE Controller" and it has the same problem, someone please help me!

 

..also, when I play music the music stutters and when I play Need For Speed ProStreet it runs slow as heck (It was fast before), could someone please help me, it would be appreciated!