How to repair Zip file?

I have my some important data in a Zip file. But when I tried to access it and open it I get the error, "The compressed(zipped) folder is invalid"

Compressed (zipped) Folders Error
Windows cannot open the folder.
The Compressed (zipped) Folder 'C:A-Data1 35_35.zip' is invalid.
There is important data in that Zip file. Please someone tell me how to repair it.
