Vista - Vista folder share stops working....

I have multiple open shared folders setup on a Vista Business SP1 64 bit machine. They are setup for anonymous use (no login required). Intermittently, the users are unable to access the shares. It seems like after a few days. The only errors messages in the logs are below but they are showing up all the time, not just when the shares lock out. The only solution I can find at this point is to restart the machine each time the shared lock out.

Event 2017: The server was unable to allocate from the system nonpaged pool because the server reached the configured limit for nonpaged pool allocations.
Event 2021: The server was unable to allocate a work item 2 times in the last 60 seconds.

Has anyone seen this? Any ideas?

You have one or more drivers leaking non-paged pool memory in kernel-mode. The secondary inability to allocate (Server service) work items is almost certainly caused by NPP exhaustion.

Fixing the problem involves first identifying the driver, and then finding a suitable update which resolves the problem.

You'll need the "Poolmon" utility out of the Resource Kit.