DragonLinux is a fully functional distribution of Linux that installs in a Windows partition, without the need to fundamentally change your Windows system. DragonLinux is designed to require very few resources to run and, in fact, utilizes the ext2 filesystem even on your Windows box. This is a perfect distribution for new or inexperienced Linux users looking to make the plunge into Linux without fundamentally reconfiguring your machine."
While the above may not be for the "geek" user, it is meant for those who are not eager to install a full blown Linux system that might overload their computers. "FREE" If you have a little room to work with, this may be just what will entice you into becomming a Linux user. And it's safe to use. Easily removed. Nothing left behind. (That I am aware of) I tried this awhile back and liked it. It has now been substantially improved, I think. A good feel about it. There is a more robust (full) version available, should you want it later on.
Oh, yeah, did I mention "FREE" to use?
One note though, the links are slooooow because there are a lot of interested people downloading it. Might want to wait a couple of days or in the "wee hours" to try for a download.