I changed the IP address of my Domain Controller and file server. The network drives I map use DNS names (\\server\share). After the IP change, I updatred A records, network adapters on the clients, and I cannot attach to them with the DA account that I logged into the computer with. However, I found a work around by authenticating with another DA account (same rights), but this account still cannot write to these drives.
This is only occurs on one Vista desktop, all my XP machines work fine with the changes.