I also have the same problem at a client, as soon as I install unmanaged client on server 2008 32bit, it blocks remote desktop.
You connect for a few seconds, then you get an error related to encryption and it drops your connection.
If you install only the AV, no problem.
Both Installations are on IBM HS21 Blades, I'm not sure it the SEP FW does not like to NIC Drivers or ???
Please assist, the 2008 is has all curent service packs etc.
The MP2 doesnt make a difference.