Cannot Send "Problem Report"

Apple no longer accepts problem reports for 10.5.8 since it is now unsupported.

You may have a dysfunctional system or system component. Try reinstalling Leopard:

How to Perform an Archive and Install

An Archive and Install will NOT erase your hard drive, but you must have sufficient free space for a second OS X installation which could be from 3-9 GBs depending upon the version of OS X and selected installation options. The free space requirement is over and above normal free space requirements which should be at least 6-10 GBs. Read all the linked references carefully before proceeding.

1. Be sure to use Disk Utility first to repair the disk before performing the Archive and Install.

Repairing the Hard Drive and Permissions

Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger, Leopard or Snow Leopard.) After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now restart normally.

If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.

2. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.

3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.

4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.

5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.

6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.

Then you have a problem. You can contact AppleCare Support about purchasing replacements fo the original discs that came with the computer or you can purchase a new Leopard retail installer package from places like eBay, CraigsList, and Amazon.com. Be prepared to pay quite a bit as Leopard is very scarce.

If you have Snow Leopard and/or Lion, then yes you can do that. I would recommend erasing the drive first if you cannot resolve your problem otherwise you might end up with a Snow Leopard or Lion system that doesn't function.

Uninstall the "AVG LinkScanner" crapware according to the developer's instructions, then reboot and test.

That's what's causing your problem. You can stop it from loading temporarily by booting in safe mode. That should enable you to remove it, if you can find instructions for doing so. Otherwise, you will have to erase the boot volume. Never install any third-party software unless you know to uninstall it.

Might try AppZapper...

http://www.appzapper.com/

What backups do you have?

You'll have to order replacements for the original discs from Apple customer service, if your iMac came with Mac OS 10.5 installed, or else use a retail Leopard disc, if you can find one and if the machine came with Mac OS 10.4.