Q: Finder keeps quitting while trying to restore its windows

My Finder keeps quitting and a window pops up telling me that the "Finder has unexpectedly quit while trying to restore its windows." The window doesn't respond when I click either "Restore Windows" or "Don't Restore Windows", instead it keeps flashing on/off and the Finder icon bounces up and down in the Dock. The computer still seems to be able to work all other applications. I've run Disk Utility, and it says the hardrive is OK, so I figure the Finder has become corrupted. How do I go about fixing this when Apple no longer provides OS cds to reinstall the operating software? Can anyone help?