windows 2K With Office 2000

On new machines with Windows 2K pro we load Office 2000, deploy them to the users with their mapped drives. When the user tries to save a document in word they get an error message that states the drive is not available or in use and can’t be saved to. When the user selects OK and goes to looke for the saved document it is there and saved ???? The error message is clearly in error but anoying to the user. We have restored the OS and needed software but still have the error. The machines are Compaq 900’s Windows 2000 and 256 Mb memory.