when installing the zfd agent on some machines, the install hangs with the
progress bar around 50-60% of the way across. There are several
msiexec.exe processes running, but they appear to be doing nothing.

I had originally tried to push to these clients with the agent distributor,
but after 12 hours, there was no status of success/failure. I manually
downloaded the MSI and attempted to run it, but it reports that a previous
install is still in progress. Not sure how to resolve this. Other
machines at the same location have the above mentioned installer hang
(these machines were not pushed to originally).

Machines are all WinXP SP2, not in a domain, and are located at across a
WAN from the zen server. I can browse to the zenwsimport address in a
browser, so that part works.