Installing a program from a remote computer

If both people are using Windows XP and to enable 'Remote Desktop Help Session Manager', then go to Control Panel - Administrative Tools - then Services. Highlight 'Remote Desktop Help Session Manager' Set to Automatic by right clicking scrolling to Proprieties and setting Startup Type to Automatic from the drop down window, then click ok. For this to work it Depends on Remote Procedure Call (RPC) to be enabled as well... Use the same proceedure from right clicking as above to enble it.
OK now the remote user will also have to create an admin account for you so you have administration access to that computer. Control Panel - User Accounts - create user name with password, then save.

Now straight from Windows help... from Control Panel - then System icon follow below.

In the Remote Desktop area, click Select Remote Users....
On the Remote Desktop Users dialog box, click Add....
On the Select Users dialog box, click Locations... to specify the search location.
Click Object Types... to specify the types of objects you want to search for.
In the Enter the object names to select (examples): box, type the names of the objects you want to search for. (eg. joe if thats the username the remote user created for you)
Click Check Names.
When the name is located, click OK. The name now appears in the list of users on the Remote Desktop Users dialog box.

Make sure the remote user is logged on as Administrator to set this all up for you.