Desktop computer can't find Wireless networks?

Okay so I got this PC computer from servitor and I got myself a virus....

Beside the point. Anyway, to get rid of it I had done a mass reset and yeah. Normally I never need it for internet because I can go to the library. Anyway, I make .videos and need WLMM (Windows) to make it, along with anther I had downloaded from a hard drive from the library. But anyway, I was going to download, it but it needs internet. So I an do it off my phone but it won't find the wireless internet connections. How can I fix this?

Either this or a FREE program that can do Stopmotion w//o it freezing.