Speaking of non-paged pool leaks, this time it is HP printer drivers under Windows 2003 - specifically "HPBPRO" causing Event ID 2019 errors and crashes

Are you having printer server problems lately with HP drivers installed?

A Windows print server has multiple HPBPRO processes running simultaneously or the HPBPRO process contributes to crashing or hanging a print server.

Some examples of what the enterprise customer may see are as follows:

CPU utilization on Print Server will go to 100% or everything looks fine but blank pages are printing out on printers. During this time if the administrator goes to Task Manager they may see there are multiple instances of HPBPRO running on the server as a process.

A customer has multiple print servers running in their network environment. Various servers are seeing HPBPRO randomly become active for no apparent reason and causing performance problems on the server. Closing or killing the HPBPRO processes or rebooting the server solves the issue for the time being.

This problem occurs when following conditions are met:

The HP Toolbox is installed through a HP Printer CD on client machine.
The Print Server has one or more EAC based Printers shared to clients.
Client machine has one to more printer connections (Point and Print) through the Print Server.

Read more about it here and download updated HP drivers to prevent any further problems.