Next, are you sure the Windows XP computers are members of the domain? And, moreover, that the computer accounts are properly logged on? To verify, try using the Resource Kit utility called KERBTRAY. Kerbtray can tell you if your machine is, indeed, logged on or if it's lying to you and it really isn't. If it really is logged on, then the Kerbtray icon will turn green. If the computer isn't really logged on, then Kerbtray will show a bunch of question marks.
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