Try Knoppix if you are a windows user and want to have Windows on your machine. You can run it off the CDROM without installing and be able to do most things. You can install it to the HDD if you like and setup a dual booting system or just wipe put windows and install Knpoppix which is basically a Debian Linux system,
You can, connct to the internet and download stuff to your machine using a program called APT.
Linux has a variety in everything - you can try them out and choose your own categories in each area
Try out the different desktops first!