Mathematica only evaluates first input, then stops responding

[Ascendant0]

For some reason, my Mathematica is not working right. I've had it for a long time, and never had any problems like this. Basically, when I start it up and go into the notebook, the first input I put into it works fine, like you can see below. But then, anything after that doesn't work. None of the types of input do, free-form, Mathematica input, none of it. It only solves for one single input, then it stops working after that. Every time I close the software and restart it, it does the same thing - I get one single input that works, then none of the rest do.

I tried resetting the settings in preferences. When that didn't work, I restarted my PC. When that didn't work, I even uninstalled and re-installed the software. It STILL has the same problem.

I don't have the slightest clue what is going on here, and what I can try to do to fix it. Any suggestions would be greatly appreciated.

 

[Frabjous]

Check that it still knows your license.

 

[Ascendant0]

Check that it still knows your license.

I tried deleting all of that, and re-entering all of it. And reaching them is near impossible.

I wasted about two hours messing with stuff on my PC until I got fed up and got a newer version of it free of cost for my troubles, lol. With how much I paid for this, I certainly wasn't going to pay again, especially after how much of my time their software malfunctioning wasted. But anyway, I'm good now, thank you though.