Gaming issues, do I need to reinstall Win 10?

My PC functions perfectly and all applications seem to run great apart from ... games Some of the games used to run fine like Borderlands 2 and GTA V but now seem to have stopped working all together. Other games run fine ie Titanfall 2. I thought perhaps an upgrade on the GPU might help but after installing a GTX 1060 6GB it made no difference.

It's a reasonably high end PC that I built myself a few years back and has been working fine. The PC specs are i5-3570K, 8GB RAM, 256SSD + 1TB HDD, GTX660 upgraded to GTX1060 6GB. The OS was Win 7 that was upgraded to Win 10 a long while back.

All games are from Steam or Origin:

• GTA V (steam) : now crashes before starting. I tried reinstalling and wiping any files but made no difference.
• Borderlands 2 (steam) : now crashes in the launcher with a .Net error
• Borderlands Pre-Sequel (steam) : won't start and crashes in launcher
• Planet side 2 : used to run a year ago but won't run now
• Crysis 3 (origin) : won't start
• Titan fall 2 (origin) : works fine
• Far Cry 3 (origin) : won't start
• Track mania : just gives a white screen but this may be a update error and unrelated
• Mark of the ninja : plays fine
• Super crate box : plays fine
• Plants and Zombies : plays fine
• Team fortress : plays fine

This list makes it look like I'm addicted to gaming which I'm not but I do like to see what's being done out there.

I've tried going to the steam/origin sites but they just put you in an endless loop reloading 60GB game files and didn't offer much advice. Because the issue is happening across so many games I figured it must be something at a lower level than the game program itself. I only get issues in games - all other software I use functions fine so I figured it might be the GPU or the software driving it. I bought a new GPU hoping that might fix issues - it didn't make a difference. I was wondering whether a reinstall of the OS might help? I bought an official Win 7 OS over the web using a key then upgraded to win 10.

Would a reinstall help? would I lose all my files programs etc? is there something easier I can try? is there any way I can get a decent error message stating what's wrong?

Thanks for reading. My apologies if this post is in the wrong place. Sorry for the long post.

Mike

I would say a clean install is long overdue, considering this was an upgrade from a previous OS. All of your games and programs will need to be reinstalled, but you can back up your files and game saves to an external hard drive.

I look at it this way. You could spend days troubleshooting and maybe fixing the issues, or you could spend a few hours doing a clean install and be much better off for it.

Why not do the basics like checking out your SSD and HDD. They are getting old now. Then working your way upwards.

Do what you like with reinstalling stuff, but if the basics are not checked you will just have a series of endless problems.