Sometimes, your path when you go to start->run, CMD will be something you don’t want. In active directory or on an NT domain, sometimes your default home path might be a network drive. This isn’t so good when you are offline or drop offline after being online. The CMD prompt is set to a place where you can’t get to.
To change the path, you can edit the registry (at your own risk)
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USERSoftwareMicrosoftCommand Processor]
“Autorun”=”c:”
This will change the path to your c: drive.
Steve Novoselac's Blog 
4 replies on “Change your Default CMD prompt path”
That didn’t work for me (WinXP)
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it didn’t work for me in Windows XP also
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The actual string to enter is cd /d c:” Note the lack of a beginning quote and the presence of an ending quote, that is not a type
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It works with “F:”, thanks!
PS: Registry type must be REG_SZ, just reopen your cmd and it will work.
Tested on Windows 7
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