Cannot install OS X ML - attempted 5 times. Its says the copy is corrupt or tampered.

Vinay Ji,
If possible backup all your data first then , open disk utility and repair disk permission and try to install ML.
If it fails , boot from Snow Leopard disk , go to disk utlity and repair disk (not permission) twice or thrice then try to install ML.
Still fails , follow the steps in the below link and create bootable USB. Boot from it and do clean install by formating the HDD first.
Note , backup first before you do anything..
http://arstechnica.com/apple/2012/07/how-to-create-a-bootable-backup-mountain-li on-install-disk/

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