Damaged software display after downloading lion or upgrading.

Damaged software display after downloading lion or upgrading.
When i want to upgrade my software evryting works fine.
But after the download is done it says that the software is damaged.
How can i fix this problem because i have done this so many times but it still stays the same ?
Please help me ?

Have you tried repairing your hard drive?  Reboot from your Mac OS X install disk (hold down C with the disk in the drive at startup), choose Disk Utility from the Utilities menu, select your hard drive and click Repair Disk.

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