Just installed NIB on STEAM and it worked fine for a while. Then it asked me to install some type of "upgrade" so I did.

But since then it doesn't work well, it's not smooth panning and image "stagers"( tiny freezes) in regular intervals.

So I re-installed it, but somehow it kept all my settings (?), so it was not completely re-installed from scratch, and I have the same problem. It didn't ask me the serial number, so I believe it just re-installed it from STEAM "memory" on my PC.

How do I re-install it completely from scratch to STEAM ? Thanks