So I replaced my girlfriend's laptop's (Dell N4010 - Core 2 Duo, 4GB DDR3) hard drive. But now, it won't let me install Win 7. "Setup was unable to create a new system partition or locate an existing system partition. See the Setup log files for more information." I'm installing 7 through a bootable flash drive. There is only one drive in the system right now. No other drive is connected besides the HDD The HDD is blank. There's nothing on it. It's never been used That includes optical drives - the DVD-RW drive is removed There are no RAID options in BIOS Speedstep is off I've tried this with the HDD in ATA as well as AHCI mode, occurs both times I don't see any option to turn off Hyper-Threading, so I assume that it's on Any suggestions? I've never had these kinds of problems installing Windows before, and I've done this like 400 times. The ISO isn't bad because it's been tested and verified working, plus I've used it on like 20 different PCs and it's fine. It's aggravating and it's scary because it's her computer, and I think I voided the warranty. UPDATE: SOLVED After trying a thousand different things, I tried another method. I copied an ISO of a Dell OEM-edition of Home Premium (that I previously tried to burn onto a dual-layer DVD and her computer still wouldn't work with it) onto an 8GB flash drive and used my girlfriend's existing license with it, and.... it worked. No complaints, no nothing. It just flew through setup easy peasy. I didn't have to put in a serial because it detected the license information from BIOS. Now I'm in Windows and it's passed all activation checks and all. Thank you so much for your help. I'm writing this down and making sure to keep this ISO for future use. That's the key. Use a flash drive to do it. I may have killed her warranty, but now I don't need it.