Open WinRAR (Download it Here) and browse to the folder with your .rar/.zip file.
Find the file you want to repair and click the “Repair” button from the tool bar.
In the pop-up window, select “Treat the corrupt archive as RAR or Zip” depending on which type of archive you are trying to repair.
If you get a “Suspicious Entry” pop-up. Select All. This may happen several times while repairing.
After repairing is complete, click on Close.
To extract your file, highlight your new rebuilt archive.
Step 7:Next select Commands>Extract without confirmation
The files will start extracting.
The archived files will be extracted to the same folder as the repaired archive.
This instructions was originally written by Adam Roper is the founder of GlobalFusion