Numba Deluxe infected?

It's probably a false positive with your anti-virus. I've had this happen with two games, one of which was Ys Chronicles. :\

change antivirus or change games to play
i would do both

probably just trying to keep you safe.

edit: i mean "sane".

Steam games should be all virus-free. I think maybe it is just a false positive. But since it's better to be safe than sorry, you should run a full scan using Malwarebytes. Personally, I use Microsoft Security Essentials as my antivirus and I've never had a problem with it, but a lot of people say Malwarebytes is better because it's not as outdated.

I had McAfee Antivirus. It was a pain.
For McAfee every game on Steam is infected.
I switched to Kaspersky and didn´t have any false-positive anymore.

Scan the supposedly infected file at Virustotal to be sure it's a false positive.

Avast is more PIA. It deleted Soul Axiom's exe without a warning. I checked the integrity five tmes, before I sorted out the problem. I wouldn'T think that it's infected, I mean there would be threads about it, if every antivirus would spot it, so I guess we are safe to assume, that it was just a false alarm.