do you know the dual boot option ?
Dual-Boot Windows 7 and Ubuntu in Perfect Harmony
Windows 7 and Ubuntu, despite their opposing missions, can get along like best pals on a single computer. Here's how to set up a dual boot system that lets you enjoy the best of both worlds in perfect harmony.
By default, Windows 7 takes over your boot-up process and wants to be your only OS, and Linux treats Windows like a weekend hobby you keep in a shed somewhere on your hard drive. But I've been dual-booting Ubuntu and some version of Windows 7 for nearly a year, and I've learned a lot about inconveniences, annoyances, and file-sharing necessities, and now I'll walk you through how to set up your systems to achieve a peaceful union of your dual-boot OSes. (Both with Windows 7 already installed, and with a clean system ready for a new dual-OS existence.)
more information now we are using 1204 .. there is no problem with my win 7 . and Ubuntu work perfectly good
how to dual-boot Ubuntu 12.04 with windows 7