i need a simple yet good lossless vedio editor?

Hello friend there are several good loss less video editors that are suitable for windows 7, they are listed below.

1. Kate's Video Toolkit
While there's nothing too surprising in Kate's Video Toolkit, it does provide some basic but useful editing features. So you can trim files or join them, link two videos with a transition, create a sequence of videos with a custom soundtrack, and there's a simple file format conversion tool as well.

2. Avidemux
Avidemux is a small but capable open source video editor which can help you join clips, cut them (without re-encoding), and apply a lengthy list of useful filters (Add Logo, Crop, Flip, Rotate, Resize, Sharpen, Remove Noise, tweak brightness, contrast colours and more).

3. VSDC Free Video Editor
Non-linear video editors can take some time to learn, and VSDC Free Video Editor is no exception (a lack of useful documentation doesn't help, either).
If you persevere, though, you'll find a capable editor with plenty of functionality: drawing and selection tools, plenty of colour and lighting corrections, some useful filters, transitions, audio effects and more.

4. MPEG Streamclip
With a download size of only 327KB, you'd expect MPEG Streamclip to be, well, a little underpowered. And yet, the program opens multiple files, DVDs or URLs of video streams; can trim, cut, copy or paste parts of your footage; and has options to rotate your footage or export the soundtrack, while its Export dialog provides more control over your finished video than some commercial products.

Windows Movie Maker is probably your best bet. It's free. Just make sure when exporting it to use the highest quality available. YouTube also has some basic editing tools that you might want to check out.