VirusScan lockups

I’ve upgraded my Win95 OSR2 machines from VirusScan 4.5 to VirusScan 4.5.1sp1 + 4160 hotfix. Since then they’ve become unstable. They occasionally lock up on login, and consistently freeze or lockup when printing to NetWare queues or writing to NetWare drives. This happens to a newly-loaded machine as well as to those in the field. VirusScan has also flat-out broken several network apps; all problems disappear by disabling VirusScan.

I’ve updated to Novell Client 3.32sp1, reapplied the VirusScan hotfix, turned off outgoing scanning, all to no effect. VirusScan 4.5 ran without a hiccup for a year, but NAI no longer supports it so I’m forced to upgrade.

Has anyone else seen this problem? Any ideas for a fix?