I have that same card and last year had to wait for Hauppauge to make a beta 64bit driver, it should be the release driver by now.
Do you want all the other crap (WinTV apps) or just the driver? I've never been able to get those WinTV apps to work so I just use Media Center and it works great.
I would download a new driver copy first (Link 4 you
) unzip the contents and then run the hcwclear.exe to remove anything it tried to install the first times and reboot after it runs.
Before you reboot tho, you need to turn off the New Hardware auto install feature. Open Control panel, then System, click Advanced system settings on the left top, then click the hardware tab and then the Windows Driver update button and check the Never Check box...reboot.
Now go to the extracted driver folder. Do not use the Setup.exe but instead right click on the "HcwDriverInstall.exe" right click and select Run as Admin. This should install the proper 64bit drivers for this card now, reboot and check Device Mgr for your tuner, it's under the Sound, Video and Game Controllers.
Then setup MCE for your TV use as required, the MCE setup should detect the tuner.