Please help me.
When I create a GUEST account in Windows XP Professional with purpose for another person using of GUEST account.
Unfortunate, that another person could not use Microsoft word 2003 or excel. because of Microsoft word 2003 have appeared the notify like this "error 25090: office setup encountered a problem with the office source engine, system error"
You need to run Office from the administrator account first so that it can set up the registry hooks and write system files. Alternatively, in the guest account, right click on the shortcut for whatever program you're trying to use and choose "Run as Administrator" (if you don't see it, hold shift down then right click and the option should be there as "Run as another user")
Then it can write the necessary system hooks to get it working properly.