To add users to the Remote Desktop User Group in Windows XP, please do the following:
- Open Computer Management.
- In the console tree, click on Local Users and Groups .
- Double-click the Users folder
- Double-click the user
- Select the tab "Member of", and then click Add
- Type "Remote Desktop Users" in the Enter the object names to select box.
- Click Check Names.
- If the name is verified, click OK