Today I decided to re-install windows 7 to make it was again, after backing up all the necessary files onto my on board 1TB hard drive I restartrd windows with the retail CD in the CD drive. I pressed F12 and chose to boot with CD rom, now after several minutes whilst the CD was starting up I filled in all the language, time and keyboard settings and pressed next. Then clicked install now. ... ... About 10 minutes later the next set of options showed up, Normal install and Custom install. I clicked custom. I then proceded to formate the main hard drive and then clicked on it to select and pressed next... . It now was saying, "setup was unable to create a new system partition or locate an existing system partition". So I tried to fix this by deleting the main hard drive and the other two vanished aswell (not including the 1TB one). So I then clicked new on this 150G hard drive and then clicked on, it now says Primary hard drive. I then clicked next. .. The same thing, "setup wa unable to create a new system partition or locate an existing system partition". now I'm getting stressed out and I really want to fix this today so I came to the internet. Please can someone help me? - Posted from my iPhone.