One way you could do this is by using Windows Movie Maker, it should be in your Start menu. Before you use it though, you'll need to convert the 3gp video file into a Windows video format, such as wmv/avi/mp4/mpeg etc. You can use this free software to convert it http://www.download.com/Free-FLV-Converter/3000-2194_4-10832044.html?tag=mncol;lst&cdlPid=10860122 Then use that file in Movie Maker, and if you wanna put it back on your phone, reconvert it using that software.
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