My PDF file is corrupted, then after searching the web I found a good thread here.
Since I hadn't gswin32c on my Windows 7 x86 system I installed it from here. Now I have it on my system and ran it now! 🙂
But my problem is that how to use the commands written there as follows:
gswin32c.exe ^ -o repaired.pdf ^ -sDEVICE=pdfwrite ^ -dPDFSETTINGS=/prepress ^ corrupted.pdf