Ok, how did you detect it? (ie: windows defender, website, virus program)
What was the name of the virus?
Those two are VERY important information as some detection programs literally detect any program that's not from a known name as a virus.
Virus detection websites will list the results of 100+ programs and give you the results, a lot of tech illiterate people see a 1/100 and think "Must be a virus!" when in truth that result says the opposite.
Finally, if the name has the word "gen" in it's name it's a near 100% chance that it's what is commonly, but not common enough known as a "false positive"