Step 1:
Open WinRAR (Download it Here) and browse to the folder with your .rar/.zip file.
Step 2:
Find the file you want to repair and click the “Repair” button from the tool bar.
Step 3:
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.
Step 4:
If you get a “Suspicious Entry” pop-up. Select All. This may happen several times while repairing.
Step 5:
After repairing is complete, click on Close.
Step 6:
To extract your file, highlight your new rebuilt archive.
Step 7:Next select Commands>Extract without confirmation
Step 8:
The files will start extracting.
Step 9:
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