From the Hauppauge website:
Error Messages when attempting to run WinTV32 or WinTV2000:
Error
messages such as: "Error. Cannot locate capture filter", "Cannot build
filtergraph", "Error connecting Vcap and HCWCap filters", "Error
connecting preview pin" can be caused by bad driver installations. Run
the latest driver on the Hauppauge
WinTV-USB technical support page to fix this. This new driver runs HCWCLEAR first, and then automatically reinstalls the driver.
Aternatively
you may receive an 'Initialization error HTV=## '. Please look in the
Device manager to see if the Hauppauge WinTV USB is listed correctly in
the Device Manager. If it is not listed properly or if it has a Yellow
mark on it, the drivers should be reinstalled.
Also,
look under Universal Serial Bus controllers in Device Manager and be
sure that the "Universal serial bus controller" is listed correctly(not
disabled) as well as the USB root hub. If disabled, re-enable, and
reboot.