IMac OS re-installation

Hi there to ALL...
This is my first time ever to use a forum and hope it's going to be a good experience...
I have been trying to re-install Leopard OS on my iMac but never been able to succeed as it is taking hours and even sometimes I leave in the installation phase for 24hrs with (Installing) message but when I come back to it, iMac seems to be hanging without any further progress.
Could some one help please...

HI and Welcome to Apple Discussions...
Are you reinstalling Leopard because there were problems with your iMac ??
Can you eject the install disk?
If so... boot from the install disk to verify the startup disk for errors and repair if necessary.
Insert Installer disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu (Panther and earlier) or Utilities menu (Tiger and later) and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
*(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)*
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
When you are finished with DU, from the Menu Bar, select Utilities/Startup Manager.
Select your start up disk and click Restart
While you have the Disk Utility window open, look at the bottom of the window where you see Capacity and Available. Make sure there is always 10% free disk space. Not enough disk space can cause directory corruption.
If you cannot boot from your install disk, try booting in Safe Mode
What is Safe Mode
If you can't eject the disk, try booting while holding down the mouse, or try booting while holding down the Eject key ⏏
Carolyn
Message was edited by: Carolyn Samit

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*"I get one of the file is corrupted and i need to get it changed."*
What's wrong with this disk? If your iMac can't mount the disk or boot from it, try cleaning it.
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