Our games do not contain any malware or viruses. However, many antivirus programs will sometimes detect false positives or unwanted behavior when you run a program or install. This is especially true for older titles. 

One major example, and one you may see, is it detecting a false positive trojan (often with the words "Heur" or "Gen" involved.). This can happen to many small and indie developers, even though the program itself is clean.