If you are having problems with Defrag "hanging up" in Windows98
Here's the fix:
1. Find the "defrag.inf" file you downloaded on your hard drive.
2. Copy this file on your hard drive to a place easy to find (you'll be using
it again.)
3. Right click on "defrag.inf" and then select install.
Doing so will add the command Defrag/All to the RunServicesOnce key in the Registry.
4. Restart your computer. When you restart your computer, defrag will run before
anything else loads in the registry, thereby preventing any program from
writing to disk.
As the name of the Registry key suggests, this program only
runs once. To run this multiple times, find the defrag.inf file on your hard
drive and repeat steps 3 and 4 again.