Virtual Memory Errors 500hours CPU time

We have a windows 2000 domain and currently have around 120 extra machines that are up, but not used, All of which display virtual memory errors after about 500 hours (or just less) CPU up time.

I believe that there was some issue with windows 2000 that caused this, but cannot now find any reference to this.

Obviously a reboot clears the error, but with our setup an automated regular re-boot is something we’d like to avoid.

Any Ideas or has anyone got a similar issue?