I have an Alienware Aurora and after it boots the BIOS it goes to a blank screen. I did hardware tests and they all passed but afterwords it said that there was an error booting operating system. I have read some posts about this same problem but most of them say to boot from my instal disc. Since I bought it with Windows 7 on it I don't have one. What am I supposed to do?

Well you could find a friend with the DVD of the same version of windows you have, and try to repair the install or you could just bite the bullet and use the Alienware recovery method as all computer sellers MUST provide a way for you to reinstall windows. remember with most recovery methods you risk losing all data / install programs.