BSOD & Reboots (random), Usually While Watching TV?

- x86 (32-bit) or x64 ? windows 7 professional x64

- the original installed os on the system? no, installed myself on a clean system

- an oem or full retail version? i got it from a legal msdn academic alliance license.

- what is the age of system (hardware)? not old. probably 1,2 of 3 years old. (amd phenom ii x4 955.) see my profile for more specs.

- what is the age of os installation (have you re-installed the os?) 6 month old, but got crashes since the beginning. if i'm correct, even before the new motherboard/cpu/mem/psu/gpu install.

i think the crashes usually occur when watching tv on my pc using my avermedia capturehd (a pci-e hdmi input card). but i think i have seen crashes while not watching tv. maybe the capturehd card increases the chance a lot. crashes can be random. sometimes i have a week without crashes,sometimes continuously when rebooting.

a crash results in a bsod or a spontaneous reboot. after a spontanous reboot, the system sometimes halts in a black screen after the reboot.sometimes even a cold reboot doesn't boot well. sometimes after a reboot, starting the tv card immediately results in a reboot. crashes often occur when doing multiple things: watching Internet, having a tv window open, downloading. but sometimes also during low system use while having a tv window open.sometimes the radeon gpu driver shows a popup "display driver stopped responding", and continues working normally.

background info:i use a ssd as boot drive. ssd health is 100%. ram is checked using memtest, which shows no problems.