Consumer, Prosumer: Adobe Premiere Elements is the most popular editing software for the prosumer editor. Adobe provides a thorough free tutorial here.
Our experience testing Windows Movie Maker (which comes standard on all Windows 7 and later PCs) produced audio overlap/duplication issues where clips meet and feel it is worth it to purchase Adobe Premier Elements.
Professional: Adobe Premiere Pro is the most popular professional editing software for PC. Adobe provides extensive free training here.