Installed a 2650 on FiOS this weekendI was previously dedicated to OTA (Hauppauge 2250 W7). The FiOS tech admitted that he had never installed CC on a PC, but was very interested in doing so. Following the package instruction and installing drivers and firmware I thought that I would be ready to rock & rollNOT!
Initially WMC didn't see the CC..This was resolved by temporally disabling the fire-wall. I later discovered the actual exceptions; (Enable UPnP discovery and Allow SSDP subnets) adjusted and re- enabled the FW. Who would have thought that a CC reader would use the OSI stack.
The Verizon FiOS tech was a great help with the install, he rechecked signal levels, tried a different CC. He took a real interest in seeing how a W7 CC reader is installed and configured. Once we got the PC to recognize the CC, we did a scan and were happy with the results. WMC configured both the 2250 and 2650 with four HD streams, yeah baby!!!!
Yesterday I found and installed the latest drivers and firmware from the Hauppauge site. Sort of pissed that I received an old bug ridden release of the driver with my 2650
Danxmanly; I am anxious to try your suggestions on USB power options, will check these setting tonight. I exercised shutting down and restarting the computer yesterday and didn't lose any tuners,. I was experiencing lost tuners before upgrading the driver and firmware.

I will report back