Hi there! I had the same problem that my System did not recognise the driver for a cheap DVR Card with a TW6805A
Chipset on it. I purcased it at Chinavasion.com and it worked out that some kind of soldering fluid blocked the contacts
on the card so the system did not knew what kind of hardware it was and klogically ignored the driver. If you use nail polish remover to clean the contacts it will probably work perfectly well.
By the way- there are a lot of sites who want you to download any kind of driver agent or so offering that it is the one for the BT6805A chipset. DO NOT TAKE THIS!
It is some kind of spyware!!! Wach out!