Yeah no worries… To be honest I can’t believe I’m helping someone out as I too am a complete noob at this!
First of all, my machine is an Unraid machine so the set up might be slightly different from yours… I tried to do the suggested restoring from a back up but it didn’t seem to do anything and still hovered at the start up page.
Instead, I went into effectively what windows would call the File Explorer, searched for where the apps install (program files for you maybe??) Create a new folder there then install a new version into that folder… Like I say, it worked for me but I use Unraid so it might be different for you, but basically you’re just trying to create a brand new install. It means you have to search for all your tv series again but at least it will work…
Just a quick tip, take photos of your config set up before you uninstall it so you know how to set it up again… I didn’t and it took me ages remembering how it was set up!
Hope that helps