In my company, we have Juniper Network Connect 7.1.0 with Host Checker. Although it is not supported officially, I found a workaround.
Indeed we identified that some of our users have disabled UAC on Windows 7 because they think that UAC is only an annoying useless feature that does nothing but bother them with popups. For a reason I don’t fully understand, NC seems to crash if the user is administrator of their computer and UAC is disabled. This behavior is not observed with previous versions of IE.
I recommended to enforce UAC with Group Policies and include it in the mandatory security compliance rules for all workstations.
Hope it helps! Regards!