Really Need Help Guys :/

Ages ago I tried to install some Day Z hacks. must have gone wrong somewhere and basically i got a global ban, i kinda shook it off, bought a new key and changed my key using a key changer from this website which was apparently trusted. Anyways my key is getting continually globally banned, a guy on some server somewhere said that it may be that i still have the files somewhere on my PC (although im sure i deleted them, but there may be some somewhere in the program files or something, i dunno. ) I've bought more keys since and changed them manually on regedit and im still getting banned.is my key being continually stolen? :S Im so confused and im tired of wasting my money on so many keys can someone help :/

Thanks, Ollie

If you are buying keys from other users and not retail, then it's almost 95% chance that the fault is in the seller, not your PC or anything. @olliegoddard

I tried a trusted website and it still didn't work...

This happened to me if your using the same in game username and battleye see you playing they just gonna ban you again. But i changed my In Game Username so that battleye wouldnt be able to ban me again because im not on that account and battleye wont know im playing.

Are you launching the game through steam after replacing your CD Key.

What he said.
If you launch it through steam, it changes your key back to the banned one.
Launch it through your C:/Program files/Steam/steamapps/common/arma 2 operation arrowhead

And to better his instructions, execute a file that says ArmA20A_Beta its a cmd i believe