Scan with malwarebytes
. Then open an elevated command prompt and type sfc /scannow
and hit enter
to ensure and/or restore system file integrity. Once infected, there is really no telling what is going on inside the system. You could probably clean your existing install, but you could never be sure. Nobody could. So best is to start fresh with a format and clean install of build 7201, 7227 or wait for 7230 to become available.
Reformat the pen drive too, while you're at it. Or if it is really cheap, throw it away.