Unfortunately, Linux, OS X, and Windows are the OS's you MUST choose to retain compatibility with the virtual world. ALL require partitioning, however, there is a solution.

Ubuntu is a GUI desktop environment for linux. It is available free for download. You can put it on a USB flash drive, boot to it, and voila! You have a full featured OS capable of the same feats as Microsoft, Macintosh, and other Linux distributions.

Here is a link providing instructions

https://help.ubuntu.com/community/Installation/FromUSBStick

I would google image Ubuntu desktop as well so you can see the wide array of options. And best of all, ITS FREE!!!

I firmly believe Ubuntu is the best OS on the planet, alongside Windows 7 64 bit of course :)

Ubuntu is light, powerful, and does not require a formal install like its cousins.
Installation/FromUSBStick - Community Ubuntu Documentation
help.ubuntu.com
The recommended way to install Ubuntu from a USB flash drive is to use the usb-creator program, point it at a ISO image of a Ubuntu installation CD that you have downloaded, and let it create a bootable USB that you can use instead of the CD.

...Computer geek that lives in the abode with Jody.