I fdownload a flie which contain complete package of MS Office. But the problem is that, the file is ISO extension type. Please tell me how can I execute this type of file

No, because Office is NOT legally distributed that way. What you probably downloaded was a pirated or bootleg copy. Such a copy may have a virus embedded in it.

But since its not a legally distributed copy, it would be unethical for any of us to help you with it.