I had similar problem on a relatives computer, but I was getting blank logs. It turned out it was windows defender. and the keylogger wast one of the best, eblaster. The problem you have is what happens to older keyloggers, like ardamax2.8 when they trouble with new systems. The fact that it happens with different keyloggers says to me, security software. That is the best I can come up with, good luck.
