If your hard-disk drive seems to take forever to go about its business, or if it's having trouble keeping up with your CD-R burning software, chances are it's time for a tune-up and defragmentation.
Close any open applications. Disable antivirus utilities, screen savers and other background programs. Make sure you've quit all programs in Windows by pressing Ctrl+Alt+Delete once (don't press it twice or you'll restart the computer).
Windows will show you a list of applications running. Highlight each application (one at a time) and click on End Task to close each one.
Double-click on My Computer to open the My Computer window.
Select the hard disk that you want to defragment.
Choose Properties from the shortcut File menu. You should see the Properties window for the drive that you selected.