How do you start up from disk

My 2007 iMac has become very sluggish. The little colorful round ball justs spins and spins so much now. I went to Disk Utility and for the first time selected verify disk. Part way through the verification I got an error message telling me "The volume Macintosh HD was found corrupt and needs to be repaired.", "Error: this disk needs to be repaired. Start up y...isc), and then use Disk Utility to repair this disk." The problem apparently comes from "invalid volume file count" and "invalid volume directory count".
I am sure this is a simple task for most but I am unsure how to proceed. I have my original OS X Leopard disk and my upgraded OS X Snow Leopard disc. Any direction in how to proceed would be greatly appreciated.

Before you do ANYTHING make sure you have a good a backup. I see you have a Time Capsule to check to see if your backup is OK.
Next Insert the original Leopard Install disk in the Superdrive. Restart, when you hear the startup tone hold down the Option key and choose the Install Disk. Select the language then click the Utilities Menu and choose Disk Utility. Run Repair Disk from there, you will need to run Repair Disk multiple times until no errors are found. If you continue to get errors take the machine into an Apple Store or AASP to have the HD replaced. Make sure you let them know you have been backing up on Time Capsule and want to restore your backup from there.

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Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
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Enter the name of the crashed application or process in the Filter text field. Select the messages from the time of the last crash, if any. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V).
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
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In the Console window, look under User Diagnostic Reports for crash reports related to the crashed process. The report name starts with the name of the process, and ends with ".crash". Select the most recent report and post the entire contents — again, the text, not a screenshot. In the interest of privacy, I suggest that, before posting, you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if it’s present (it may not be.) Please don’t post shutdownStall, spin, or hang logs — they're very long and not helpful.

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How do you start up from disk

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