New
#11
If the sfc shows nothing use this tutorial
Repair Install
Look at the tip in step 5
If you do not have a Windows 7 with SP1 installation DVD/USB, then you can download the latest official Windows 7 with SP1 ISO file here: Microsoft: Windows 7 Direct Download Links, and use Windows 7 USB-DVD Download Tool to create a bootable DVD or USB flash drive with the ISO to do the repair install from within Windows 7 using this step.