If you are a WinXP user, please use v1.34 package (downloadable at http://www.nvidia.com/object/dualtv_full_1.34.html).
If you have a new Vista PC or a PC with fresh install of Vista, please use the v2.02 package (http://www.nvidia.com/object/dualtv_winvista_x86_2.02.html for Vista x86, and http://www.nvidia.com/object/dualtv_winvista_x64_2.02.html for Vista x64).
If you are upgrading a WinXP PC (with DualTV installed) to Vista, you may see the v126.96.36.199 DualTV driver from Windows Update. You can install this driver from there. However, the DualTV Vista/MCE extension is not available at Windows Update. NVIDIA recommends that you download v2.02 DualTV software from http://www.nvidia.com/content/drivers/drivers.asp and install this package instead.
Note that v2.02 package for Vista, which includes v188.8.131.52 driver, obsoletes the v184.108.40.206 beta driver for Vista.