How To Install Windows 7 Over Pre Installed Ubuntu 12.04

But now I am upgrading my PC, so I want to install Windows 7 over Ubuntu 12.04 for driver installation & other stuff. After that I will dual-boot Ubuntu 12.04 (or maybe 12.10 who know :) )

Anyways, please tell me how to replace Ubuntu 12.04 with Windows 7.

Also, can someone tell me if there is a tool so that I can make my USB drive bootable with Windows 7 on my Ubuntu 12.04?

Please help ASAP!