I need to re install my software but dont have disk on a iMac 10.7.4

i need to re install my software but dont have disk on a iMac 10.7.4

Is it the OS Software you need to reinstall?
If so, 10.7.0 or later...
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partitirion & use Disk Utility from there to Repair the Disk.
Then Reinstall the OS.

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