BlessedSquirrel
We love you Ukraine
I'm afraid that's 101 not to do as you'll get major driver conflicts.my other friends in tech have also been doing for years. Never had any issues.
You'd need to do a clean install.
Your friend may have gotten away with it in stability terms although I guarantee he's not getting full available performance, but I guarantee it's contributing to the issues you're having, it's completely expected in fact.