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