To get all the files back it is better that you show your laptop to an expert like stellar data recovery service. I can vouch for their service. They do an amazing job in regaining the files without any glitches.
The only option that will not erase your personal files is, Microsoft System Restore.
Remember that this option will just allow you to return the operating system to a previous point in time.
So the better option is that you show your laptop to an expert or search for online laptop repair service. They do a wonderful job in recovering the files without any faults.
This problem is very simple. Just download a Bitwar Data Recovery on your computer
You can also google some system restoring software or just visit the following website for more help www.download.com
Go to system restore and click which restore point you want and go from there. You wont lose any files