It sounds like it didn't give you a location or name for the file? Without that, you won't be able to tell whether it's a dangerous file or simply a false positive (something that it thinks is a virus but really isn't).
I have a lovely PC. It's all fast and wonderful. It plays games such as F.E.A.R, Black and White 2 and The Movies perfectly well, and does every non-games-related task I wish to throw at it without breaking a sweat. Well, except for one thing.