With Windows you have lots of choices for video editing. A lot depends on how much you want to spend. Good choices are under about $100 include
Movie Edit Pro 17 plus (Always get the plus version of Movie Edit Pro) by Magix
Vegas Movie Studio HD Platinum by Sony
Premiere Elements by Adobe
These are all very capable programs
If you want more features the three companies offer "Pro" versions
Magix's pro version is call Video Pro X (VPX)
Sony's is Vegas Pro (new version 10)
and Adobe's is Adobe® Premiere® Pro CS5
There are other video editors but I have personal experience with some version of all the programs listed above.
You can download trial versions of all these programs (even the pro versions) from the Companies' web sites. For lots of discussion of pros and cons you can go to http://www.hv20.com/forum.php
HV20 forum. You can also find some discussion on this site for example http://www.luminous-landscape.com/forum/index.php?topic=44986.0
, and http://www.luminous-landscape.com/forum/index.php?topic=45764.0
Which of the editors is best really depends on your needs. They all capture video from the video camera, can edit it on a time line, burn a DVD or BluRay, add some special effects and audio, and add nice titles. All of them let you use multiple tracks of both video and audio. All let you add stills to your movie. The non-pro versions handle building a DVD with menus and burning the DVD easier than the pro versions. Magix's software and Vegas can smart render that means that if you have a scene that is in the correct output format they will just pass that through to you output file. Premiere (at least previous versions not sure about CS5) always had to recompress scenes even if they were in the correct format to start with. Sort of like if you have a jpg file and want to resave it, a program that does smart rendering saves the file without recompressing; it a program that does not smart render will recompress the file before it saves it. Smart rendering improves quality of the output and reduces the time necessary to output your video.
Be sure that the software supports the type of video files you camera produces and can produce the type of output file you want to distribute or share you video.
I would suggest you download the non-pro trials first to see you any of the programs meet your needs. If you need more features, then try the pro trials.
And don't forget the free Windows Movie Maker (Called Windows Live Movie Maker in Windows 7 http://explore.live.com/windows-live-movie-maker?os=other
Good luck and have fun.