While this dosent specifically answer your questions

This is a good place to start to look for answers for tuner cards
TV Tuner Cards
Oh, and by the way those with the problems: that is so typical of the software so make sure and look at leadteks faq, as there is a specific convoluted way to install their driver and software.
" Taken from a faq that I keep stored"
Q: Why my system crash on the crossbar driver every time as I install WinFast TV2000 XP from the CD-ROM wizard?
A: Please do following procedure:
1.) After install DirectX 9, remove the current driver and application from Add/Remove program (find
under control panel). If it does not allow you to remove the items, just
leave it. It will fix itself after we complete the entire installation.
2.) Check under device manager, remove all the WinFast TV2000 XP related items.
3.) Leave the driver CD in the CD drive, then restart the system.
4.) When windows boot up, the "Found New Hardware Wizard" should pop up. Use
the Wizard and select "Install from a list or specific location(Advanced)".
Next, select "Include this location in the search" and use the "Browse"
function to point to the Driver CD. Point the directory to "WinFast TV\DRV\"
then next. Keep repeat step
4.) until all the devices driver are installed.
5.) After installed all driver, you will be back to your desktop. Go into
the Drive CD. Go into folder "WinFast TV\AP" Then run the Setup.exe to
install the application.
6.) after all application are installed, restart the system.
This should allow you to install the driver and application program for the
TV 2000 XP - Deluxe under all version of Win XP.
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Q: After installed DirectX 9.0, as I install TV2000 XP, why the system can't not find "tsbyuv.dll" file? ( Windows XP and Windows ME both OK)
A: Never mind this message, please press "skip" button as you meet the dialog box again.
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Hope that helps........
Laterz,
dafanman