Did you install the Desktop Software while logged in as you, or a different user? As mentioned above, the Palm Desktop software needs to be installed for each user individually.
A couple of items to consider while performing the install:
1. If you want other users to be able to see your data when they open the Desktop Software (while logged in as another user), you should all use the same install path (default). Normally this would be:
C:\program files\palm
2. If you want to keep your data little more private, and would like to be able to install various conduits (say one user wants to sync with the Desktop Software, and another user with MS Outlook), then you should change the install location for each user. Something like the following would probably be a good idea:
C:\program files\palm\username
In any case, you'll need to reinstall the Desktop Software while logged in as the user that will be using it, and you'll need admin rights when doing so (note, as mentioned above, that the admin rights may be taken away after the installation is complete).
I hope this helps
AlphaGuy