I must say that I also experience great problems in both Vista 32 and 64.
I have narrowed the problems to an incompatiblity between my TV tuner (Hauppauge HVR-1100) and Vista MCE. If I try to configure Vista MCE most of the times it will not find the Tuner card (Vista MCE only recognizes the DVB part of the card).
In addition I keep getting an event log error every time a boot up the computer which says something like Evendt ID 4 in connectin to a hardware/driver errorhttp://www.avsforum.com/avs-vb/showt...php?p=14483460
When I roll back to a restore point prior to starting Vista MCE for the first time the error does not appear. Using SageTV the system is totally stable I have it running non-stop now for 4 days.
I think its a pity that no one in the forum care to comment or make suggestions in my previous thread. I think it'll be quite relevant for many people using Hauppauge cards.