I've seen TID's regarding the loss of keyboard and mouse functionality
related to ZFD 4 but I had an unusual experience which left me with the
same result.

I installed ZFD6.5 agent over the top of ZFD agent 4.1 on an XP box and
didn't like the result. I restored back to an XP Restore Point prior to
the installation. The restoration did not complete normally. Upon
rebooting I'm now with keyboard and mouse function.

The TIDS relating to ZFD4 don't seem to relate to/resolve my situation.
Any thoughts???