arihant12 :
how to repair pst file? can you help me
I am very sorry to inform you that that is not possible, in most cases when files disappear you have a good chance of recovering it.
But when a part of a file gets corrupt/broken it misses pieces of the file which have disappeared in a black hole.
I can assure you that there is absolutly nothing you can do, no program will be able to put the puzzle pieces back together, i highly recommend looking for a back-up file.