What did the chkdsk report ?
If your install disk is a retail copy and doesn't include SP1, you can download an ISO that does include SP1 by entering your product key into
https://www.microsoft.com/en-gb/software-download/windows7 and if accepted will release the appropriate download for your version.
You can then create bootable media using the Windows USB/DVD Burner Tool to either perform an offboot sfc /scannow or a repair install.
http://wudt.codeplex.com/If your install disk isn't a retail copy and doesn't include SP1 then see if SP1will uninstall by going to Installed Updates and enter KB976932 into the top right search box.
Right click on it when it comes up and select Uninstall.
To perform an offboot sfc /scannow you will need to change the boot order by tapping F12 as you switch on, select ODD or DVD drive - insert the disk and press enter.
(I have my laptops permanently set to boot from CD/DVD and USB before the HDD by tapping F2 as you switch on then use the cursor keys to navigate to Boot then highlight the SSD/HDD and then use F5 or F6 to move it down below the DVD and USB drives - F10 to Save and Exit - OK).
Tap any key to boot from CD/DVD when prompted then you may be presented with an inverse window with Windows Setup (EMS Enabled) highlighted - just press enter which will take you to the splash screen to select Repair your computer.
Change/confirm keyboard/currency - Next - then make a note of the partition where it locates the volume to be repaired as it isn't always C
In the Windows Recovery Environment (WRE) select Command Prompt and enter (where X is your partition letter)
sfc /scannow /offbootdir=X:\ /offwindir=X:\Windows
If that also fails to run then enter exit to close the cmd window, open the disk drawer and Restart.
You'll then be looking at a repair install which doesn't affect your programs or personal stuff, but it's advised to back up your drivers folders onto something like an USB stick.
They can be found at C:\Windows\System32 where you can drop them back in after the repair install if necessary.
You'll have all of the Windows Updates to reinstall but they may be easier with just having the Cumulative Rollup to install, although there could be a number of Optional Updates.
Go Start - click on Computer then close the disk drawer and then click on Setup.exe or Install to start the repair install.