I wanted to try out Ubuntu, but I really don't like it.
How do I delete/uninstall and revert back to my previous Windows 7?
For that i need to how did you install it? If you installed it using wubi then just login in window7, goto control panel>Programs&featues then uninstall ubuntu.
If you install it using partition then
i think this will help you http://www.makeuseof.com/tag/nongeeks-guide-safely-uninstall-ubuntu-dualbooting-machine/
but may i know what makes you to uninstall Ubuntu ? If its because of some OS problem then we can help you to solve it .