Edit registry from a command prompt?

If you know exactly what you need to edit, you could create a regfile and put it on the boot disk. Then after you boot with the disk you could run regedit.exe from the command prompt with the regfile as the parameter. This will merge the the file you created into the registry. I have run this on 95/98 with success.

Hope this helps,
Dave

The Dude is right. Here is an example. Create a file called TEST.REG with these lines in it:
REGEDIT4

[HKEY_USERS\.Default\Software\Microsoft\Internet Explorer\Main]
"Start Page"="https://www.techrepublic.com"

To run the file from the commandline, type:
REGEDIT test.reg

This merges the file, and your new default home page is at TR.

The easiest way to create a .REG file is to go to another machine, edit the registry, choose the key you need, and "Export Registry File".

see the following microsoft knowledgebase article:

Q131352

hope this helps!