Why are all my battl.net games crashing now?

[Windows 10]

I have had this computer for almost 4 years now and never ran into any issues playing games. I haven't been playing games on this computer in awhile and just started trying to play games again, but they are always crashing after 5 minutes of launching. All my games are from Blizzard Battle.net account. The games will just close out and every few attempts I will get the blue screen of death with a error stop code. I do know my computer tried to install windows 11 (I think) and there were errors and complications to where I had to change everything back to windows 10.

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