Question : Access windows XP from windowns 2000 Hidden shares C$ D$ admin$

I have a workgroup set up with a win2K and winXP but i can not access the winXP from the win2k but I can access the hidden shares fine from the other way.  FYI: i am using the run command with the unc \\computer_name\C$ or \\computer_ip-address\C$ also both computers have a user account which are members of the administrators group.

Answer : Access windows XP from windowns 2000 Hidden shares C$ D$ admin$

Is it WindowsXP Home or Professional? If Professional, you need to turn off Simple File Sharing. Do that like this:

Double-click My Computer. Click Tools, Folder Options, View. Slide all the way to the bottom and turn off the Simple File Sharing.

Also, you should verify that the shares are in fact in place with "net share" at a CMD prompt on the XP machine.