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The 750 is a known-bad card, multiple issues, especially overactive AGC.
Windows treats almost all capture cards like webcams now, especially Win10 and Win11. So for capture cards to not work properly, or at all, is the new normal for at least 5 years now. So many cards have stopped working with each new Win10 update (as each "update" is more like a whole new Windows, not just a small update).
Did you upgrade from Win7 to Win10, when the card was working on Win10? It's an old trick to install something on an OS, and then upgrade the OS, and it still works. But natively, it will not install correctly, or at all. I've not seen this done much since the 90s-00s, but I know it still works.
Or perhaps you just need a new installer disc? Perhaps the CD file is corrupted enough to not work, yet not corrupt enough to open/run from the CD? I've see that.
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