Kendall,Defrag is a way of 'tidying' up your hard disk.
It trys to put your programs in order, and can make things work a lot faster.
Click 'Start' 'Accessories' and 'System Tools' and choose 'Disk Defragmenter'
Choose to defrag 'C' or whatever your hard drive is.
Start it working and then go out.
It can take several hours to complete. If your told that your disk doesn't need defraging, ignore it, do it anyway.
Hope this helps
Ed