If there are any problems with HP drivers then the NTScrubber utility is the one to use.
The utility will completely remove any remnants of HP's driver set on a machine. Once rebooted one can then work towards installing the printer or printers again.
Microsoft Cluster MVP
Co-Author: SBS 2008 Blueprint Book
Chef de partie in the SMBKitchen ASP Project
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Third Tier: Enterprise Solutions for Small Business