Guys thanks for all your help and suggestions. It took me close to 5 hours to solve and definitely had to do with MS blocking the ZWT keygen in what ever way they did! I ended up booting into safe mode, restoring to Friday's restore point which didn't cause any trouble and then when I booted normally I got the start menu. I immediately downloaded the MS toolkit and ran activate and then went online with slui.exe and validated. I also ran sfc /scannow again to verify that everything was alright. I just hope that this KMS activation isn't blocked as well. Thanks again
Only note that some AVs tag AutoKMS as a virus/hacktool and silently remove it. You´ll havt to make exclusion in these AV. MS is blacklisting ePIDs (stored in tokens of client machines to identify the host which was used) of some of the leaked KMS Hosts, but so far not the ones used by MTK by default. In case they will do this in the future, simply choose another ePID.