vahid67 wrote:my problem in windows XP solved when i update mainboard bios but in windows 7 my system after restart cannot recognize DVB card...
all points to hardware incompatibility with your motherboard, including the fact that BIOS upgrade helped for WinXP. so, you can try your 6920 card in other motherboard and i'm quite sure it will work. unfortunately, we can't do much about it and you should ask your motherboard manufacturer for technical assistance and help - they should be able to tell you why PCI-Express slot on their motherboard is not functioning in such unexpected way.