Windows 7 cant boot

Try Repairing The Windows 7 Installation

1. Insert the Windows 7 DVD and restart your computer
2. Boot from the DVD.
3. Choose your language and click Next.
4. Click Repair Your Computer and then select the operating system you want to repair.


If that doesn't fix it:

1. Insert the Windows 7 DVD and restart your computer
2. Boot from the DVD.
3. Choose your language and click Next.
4. Click Repair Your Computer and then select Command Prompt and try the following commands (a single command might work, or you may need to use multiple commands depending on the exact problem):

bootrec /fixMBR
bootrec /fixBoot
bootrec /rebuildBCD


Note: there is a space before the /