Check and select Windows XP (Service Pack 3) or Windows Vista . Manual INF Installation :
(Open Source)
However, if you are building a new DVR machine, consider migrating to using the open-source tw68 kernel driver (available on GitHub). But for a legacy setup where Windows 7 is mandatory, the guide above remains the definitive solution. Dvr Card Techwell Tw6802b Driver For Win 7 64 Bit