See if this helps:
     1. Click Start, point to Settings, and then click Printers.
     2. Right-click the Printer icon, and then click Set as Default
Printer.
If you have a default printer installed but Outlook cannot locate it, remove
and re-install the printer. To do this: 1. Click Start, point to Settings,
and then click Printers.
     2. Right-click the Printer icon, and then click Delete. Click Yes if
you receive a prompt to remove extra files.
     3. Double-click Add Printer, and then follow the Add Printer Wizard
instructions. Click Yes if you receive a prompt to replace the existing
files.