Windows cannot access \\tp-server?

ity says “You may not have the appropriate permission to access the item” which i set to “everyone”.. I have been having this problem the whole day with my server which runs XP Pro SP 2 .. i done almost everything in the book but still nothing then i had to restore Local Policy and change the group tittle which is a load of work when u got many machines like i do.. is there anybody knows the quick fix to this shyt?.. i got clients running different O.S.. googlin it didn’t help! the server runs SQL 2000 and it has to be up in fifteen hours otherwise am gona have to do the whole thing all over again.. 🙁