At startup Windows 7 freezes at the starting Windows screen with the logo. If left alone it will just reboot and freeze at the same place. If I use the power button to shut it down, upon restart it gives me the choice of trying to repair it or normal mode. I have tried startup repair and it says it cannot repair the problem after about 10 minutes. I have tried restoring to an earlier time and after a while it says it could not restore and I have tried every past date that appears. I have have tried "chkdsk /r". I am unable to get it to go into safe mode, because when I use F8 it either tries to start Windows or brings me to the repair of start normally screen. I have booted up the computer with utilities like Fix-it, PowerSuite 2012 Golden Edition and Winternals Administrator's Pak. I am still unable to get this computer to boot and have been hoping to avoid wiping the drive and reinstalling Windows. Any suggestions would be greatly appreciated. I should also mention that I have the hard drive partitioned and was testing Windows 8 on the other partition. Both were working fine and Windows 8 started to have problems. It boots up and allows you to use it for a few minutes then it freezes and the mouse moves but you are unable to click on any tiles and have to do a hard shutdown. Therefore, I just installed Windows 8 onto another computer and just continue using Windows 7 and it has been about 6 or more months of just using Widnows 7 before the freezing started. The computer is a Dell OptiPlex 990 with 8GBs of RAM and a 1TB hard drive. Can supply the full specs if needed.