Hi
First make sure that your File Sharing is configured correctly on both
computers.
This link might help in case of trouble with sharing:
http://www.ezlan.net/sharing.html
When File sharing is configured, and it is working correctly you can map
drives across computers.
Let say that you have two computers we will call them X and Y.
Each one of these computers has Drive C:, the goal is to make Drive C: of
computer X available on computer Y.
In computer X you make sure that the drive is sharable, then you switch to
computer Y, and on Computer Y Map the Drive C: of computer X.
You can (as example) map it as drive X

. After mapping computer Y will
show in Win Explorer two Hard Drives, its own C: and Drive X: (Drive X is
Drive C: of computer X).
How to Map? Look for the term Drive mapping in Windows XP native help.
Jack (MVP-Networking).