AVS Video Editor is a professional Video editor, which can edit all video formats. With this video editing software, you can edit flv files without change the FLV video formats. For more details , you can look at their official site AVSmedia official Site or download free trial Here! (a litter large, be patient)
Step 1: Free Donwload FLV to AVI editor, convert FLV files to AVI video formats.
Step 2: Use Windows Movie maker to edit the converted AVI video files. Currently Windows Movie maker (Microsoft Already pre-installed it on Windows XP/Vista, you can find it in the folder: C:\Program Files\Movie Maker) Otherwise, you can not edit FLV video formats directly with it, software that can convert FLV to other video formats, such as convert FLV to WMV, FLV to AVI, or FLV to MP4 was needed, Then use Windows Movie maker to edit the Video.
After that you can directly upload to YouTube like websites they always allow many video formats like AVI, MPEG, MP4, 3gp etc.
