Reposted: Help with HDMI solution

First Id like to note that a mod moved my last post and locked it stating it had nothing to do with kodi which I was completely unaware I had to specify I was trying to stream this to kodi……

secondly kinda rudely done as there are numerous threads here with similar questions like this one just 10 or 15 threads down http://forum.kodi.tv/showthread.php?tid=304370

Perhaps one could explain how my question is much different from the post shown above

Original post:

I am trying to come up with an inexpensive solution for something I cant find hardly any information on.

Ultimately this is all I am trying to achieve…..

Have my cable box output displayed in a window on my desktop….. that’s it

seems pretty simple but its been almost impossible for me to do because I run into road block after road block no matter how I try to go about doing it

Ive tried to go the route of coax into a wintv card, but this doesnt find any chanels at all in any pvr I try.
WMC finds channels but requires IR.
Fake IR blaster doesnt seem to work probably because it was written for Vista and Im on Win10.
I have an IR device I can put into my comp but really this route isnt what I want anyway as I wish to control the channels and such through the set top box remote.
Lately Ive been looking at Game capture cards and devices but Ive realized that those too have hurdles in the form of HDCP.

So … Basicly im asking for some kind of guidence before I spend money on stuff I dont need or wont work.

I am fairly certain this is not HDCP 2.2 as my TV is rather old.

All I want….. Is to input my HDMI signal from my set top box… into my computer to display that signal in a window…. therefore giving me access to the cable I pay for on my desktop.

I am simply trying to funnel all of my devices through my ccomputer and onto my desktop so I dont have to swap cables or change to different input sources on my TV anymore.

EDIT: I do not at this time have an HDMI input on my computer video card so a USB3 device is preferred. I am also Trying to retain HD quality…. Stepping down to SD is not really an option on such a large screen.