Welcome to the forum!
🙂It sounds like you may have picked up a virus that has corrupted some of your files, I would suggest that you do a fresh re-install of your OS.
As far as a guide to OC without voltages and all that stuff, well you might be able to OC 2 maybe 3 hundred Mhz but if you are wanting more then the voltages and all this stuff are absolutely required, you can't really OC without them !
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