I recently installed an ATI TV Wonder Pro card and found that the TV video would periodically freeze, causing system to lock up - no mouse, keyboard, etc. Also, TV Record would freeze after exactly 1 minute 8 seconds. Using other TV software was better than ATI with longer time before freeze, but with "stuttering" - where picture would freeze for several seconds and then continue.
I finally solved the problem (so far anyway) by adding all ati dlls and exes in the windows\system32 dir to Avast exclusion list - there's 11 of'em. I also added the "ati technologies" and "ati multimedia" dirs (in program files) to the Avast exclusion list.
Finally, to solve the record freeze, I added the dir I use for recording destination to the Avast exclusion list.
I've let the TV view run for about 5 hours now with no freeze. I also recorded for 90 minutes.
I thought this "fix" might be helpful for others.
When I have time (and feel like being bored to death) I intend to remove files, one at a time, from the exclusion list to see if I can narrow this "fix" down a bit.