What to do if we do not have second computer?

In case there is no second computer, then shut down your computer , remove the hard drive of this computer. Install a new drive, reinstall windows your windows recovery software on it. Once you have done this, reinstall the infected hard drive back to the computer as a second hard drive.

Please make sure that the Windows “Check Disk” utility program does not try to repair the drive when it is booted. Then you use your recovery software to recover the data to your new hard drive. In this way you can do your safe and secure windows data recovery.

As per my experience I have researched on many data recovery software. In comparison to others I find some cool features in Stellar Phoenix Windows Data Recovery v4.1 . It is a user-friendly Data Recovery application built with highly interactive user interface. There are two scan options here ie: Quick and Deep. The Raw recovery feature of this utility performs signature based file search on a corrupted hard drive partition.

You can download the demo version of this software to preview your lost files and folders. This is safe and secure data recovery software to go with.
http://www.windows-data-recovery.net/