Digital Video editing(?) help

I've shot several videos with a Kodak digital camera and they've turned fairly well, except that I cannot change the orientation of the video itself; it needs to be turned clockwise 90 degrees for proper viewing.

The software that I have doesn't seem to have the capability to do so- can anyone recommend a free program that will allow me to re-orient the video for display purposes?

Thanks in advance for any help and advice....

Best thing I can recommend is http://doom9.org. It's been a while since I've done video editing but that site was the to-go place for guides, downloads, and all sorts of good stuff. Best of luck.