Hi there SlickVic78,
I use O&O Defrag V6, the best and at the same time the most user-friendly defragmentation software for Windows XP, Windows 2003, Windows 2000 and Windows NT 4.
I like it because I can "install and forget" about defragmentation. Once the automatic defragmentation is turn on, it detect when the CPU is running idle and start defraging the hard disks. Doesn't take much time to defrag 120GB. I was never tempted to go to Task Manager and see how much it is CPU intensive - so I will have a look at it next time. It is running smoothly over here and haven't given any problems yet.
Cheers,
McoreD