Dave,
Possible that the easiest solution is to install another drive / name it f
and reinstall.
Windows installer is looking for the original installation point which was
your drive f. You could try this utility:
http://support.microsoft.com/default.aspx?scid=kb;en-us;290301
depending on your Windows version. Have not tried it with Windows XP sp2 and
as stated it is provided "as is" by Microsoft.
This may help in cleaning you c drive, so you can install there.
As you have found, Office and Windows should be installed on the same drive.
Chris Schatte
use the Office Online web based newsreader here:
http://www.microsoft.com/office/community/en-us/default.mspx
In Office System 2003 applications:
Help/Assistance Pane/open Communities