Losing printer configuration in Vista

We have a desktop running Vista Ultimate on a workgroup.  There are two primary printers--one share from another computer in the workgroup and one is a neworked document center.   We have installed the Vista drivers for the printers.  However. every three to four days when the user of this machine tries to print, the desktop says no printer installed and asks for printer to be installed--which he does and everything works fine for a few days then the problem recurs.  Also, the problem sometimes occurs when he tries to send an e-mail from Outlook and before the e-mail can be sent the computer asks that a printer be installed.  Any suggestions would be appreciated.
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Does this Vista machine have SP1 installed? And all updates?

dur2348Author Commented:
Yes.  I have also learned that what exactly is happening is that it is losing selection of the default printer and the default printer has to be chosen again.
dur2348Author Commented:
After searching answers at multiple locations, I decided to use SetDefaultPrinter utility from www.thirdring.net.  This utility sets the default printer at computer startup or whenever you choose to use its shortcut.  We are rebooting the machine each morning and so far this seems to have solved the problem.  I am closing this question now hoping that this will solve our problem.

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Windows Vista

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