I think something is corrupted, either Windows or EA anticheat. I know you have done everything to fix it but I think a fresh install of Windows might be the only option. Sometimes files get corrupted and because of that things like EA anticheat don't start because your system is missing files and/or can't read them. I'm sorry if this is a bit repetitive, but unless you have classified files on your PC I'd suggest you reinstall Windows. Many times on the internet people say to reinstall Windows (and I hate when they say that because its always something else) as a first step option, but from what it looks like you've done everything you can besides a reinstall.
