deb,

All of the above are good advice but the proper way to Defrag any system is to:

First" “Clean the registry”.
BeClean is a very quick, and simple program which you can obtain from a web search.

Secondly: Once the registry is clean, then do a DiskScan which will detect and repair any disk error especially in the boot sector.

Thirdly: Shut down All programs except Systray and Explorer (if shown in the Close Program list…Ctl/Alt/Delete brings up the menu)

Shut off all power saver settings and screensavers.

Now you can run Defrag.

Reboot the computer after it finishes.

Wawla!

Techie