Receiving Data Execution Prevention error

When I right-click on a networked printer on a Windows Vista laptop (the
printer is hooked-up to a Windows XP desktop) and choose Sharing I receive a
Data Execution Prevention error.

When I right-click on the networked printer in Windows Explorer (under
Networks) and choose Properties I receive an error stating that Windows
Explorer must restart due to errors. When I click on details it lists
printui.exe.

FWIW - I cannot print to the printer from my Vista laptop. I have no problem
viewing shared files in Shared Folders.

Your help which would stop me from receiving either the Data Execution
Prevention or Windows Exporer help would be appreciated.

Thanks for looking.
--
Cheers,
John