I have ZenWorks for desktops 6.5 on a NW6 SP5 server
Policies are working nicely except that when the user logs on a popup box
comes up saying "cannot find rundll32.exe" If I cancel the dialogue the
workstation is useable. However if I do nothing the dialogue box goes after
about ten seconds but then the machine is unbelievably slow and has to be
powered off.

Any ideas what could be causing the problem?