multiple user access not working

SOLVED

Recently we set up a new computer for a client and now that one perticular user can not access Sage Timeslips whenever anyone else is on. if either of the two other users in the office are on then she can not get on. But the other two users can get on just fine. I think it has something to do with her user. I made sure that I named her computer the same as the old one but I think its something more. Ideas would be appreciated these are lawyers and are getting upset about the product.