xp account problem

Hello:
I recently upgraded my win2k server. I have a mix of 98/me and xp pro clients. My win98/me clients work fine, my problem lies with the xp clients. I went to run quickbooks, quickbooks responded with an error massage saying that the account was created with restricted acces. I whent and checked the account settings both in the server and in the workstation, this particular user is setup as an administrator in both places but i still get the same message. Any suggestions will greatly be apriciated.
Thanks in advance.