Run chkdsk to repair disk errors
First of all, don't panic! If you panic and do things without thinking about consequences, you might damage your system and lose data. The solution to this problem is usually very simple. Your hard drive might have disk errors, therefore you are not able to start your system. This often happens when you restart your PC during a boot-up sequence while it's loading safe-mode for example.
1. Step Find your Windows DVD that you used to install Windows 7,8 or 8.1
2. Step Start your PC, insert your Windows DVD and hit a key when you are asked to (to boot from DVD). It is possible that you have to change the boot order in your BIOS to boot from DVD.
3. Step Follow the instructions on the screen, but don't install Windows 7, instead click on "Repair your computer":
The installer will now search for Windows installations on your PC and list them all. Select your Windows 7 installation and click on next.
4. Step Open the command prompt.
Attention: Do NOT click on "System Restore" or "System Image Recovery". If you try to restore/recover your system that way, you might damage your Windows 7 installation irreversibly.
5.You will probably be in a folder X:\sources\ . Don't worry, if your partitions are still there you can run a chkdsk on them.
Run a chkdsk for your main partition (e.g. C:), to do that enter:
chkdsk c: /f/r
This will, in most cases, repair your disk errors and you will be able to start Windows 7 again.
/f /r will both fix errors and recover lost data.
/f will only fix errors on your disk
/r will only recover lost data
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