»I need a Guide.. please help

I downloaded a regedit that made my ping went from 200 to 400-500 i need help how to delete it :/ , someone tell me please..

 

If you have a recent system backup you can use that to go back to an older state of your windows system. There are many tutorials how to do this.

 

I don't have that, can you tell me another solution?

 

Regedit doesn't increase ur ping , it decreases ur latency

 

reinstall minecraft just go type in your pc bar %appdata% click on .mineraft and delete it then vowala
works like magic BUT
keep in mind that you wanna backup your saves file and your mods file before deleting .minecraft

hope that works for you