Hauppauge WinTV PVR II (26xxx) tuner not recognized by Media Center

I have upgraded my system to windows vista and since then Hauppauge WinTV PVR II (26xxx) tuner is not getting recognized by Media Center. When i try setting up the TV, it says there is no TV tuner or it is not getting recognized. I never had any issue before upgrading to vista, i have checked out the manufacturer for latest driver but it seems as if they haven't come up with it by now. So what are my options now?? Is there any workaround by which i can get Hauppauge WinTV PVR II (26xxx) tuner recognized by Media Center???

Which version of windows vista you have upgraded to?? is it 64-bit? I have checked out hauppauge site and i can see driver for PVR-250 but that's for 32- bit and not 64-bit. So if you have upgraded to 32 bit version of vista then you can download and install latest driver from hauppauge site. In case you have upgraded to windows vista 64-bit than you can contact hauppauge support and ask them if you can use PVR-150 or PVR-500. They have 64-bit driver for PVR-150 and PVR-500 but i am not sure if you can use them with Hauppauge WinTV PVR II (26xxx) tuner.