Repair HD with original Installation disks

Help, I ran Disk Utility on my startup disk (iMac HD) to be advised it was corrupt and I need to start up my iMac with another disk (such as your mac os x installation disk) and then use the disk utility to repair the disk.
My original os x installation disks (2 off that came with imac at purchase) are for os x 10.4.10 - I am currently using os x 10.6.8. If I do the above with the 10.4.10 disks will it change my os x level back to 10.4.10 or just use it to repair the HD and leave 10.6.8 and my data as is?
I'm doing this as my imac has slowed considerably for all apps and stating up - my best guesss is this corrupted startup HD is a major contributing factor.
Can anyone advise if I should go ahead and what the results will be.
Thanks.

You should be able to check and hopefully repair the drive with grey Disk 1 that came with the Mac. This doesn't alter the version of OSX you have installed.
Although you hopefully won't need it do you have backup you can restore from if it turns out the disk is unrepairable?
Restart with grey Disk 1 in the drive whilst holding down the 'c' key. (You're not going to re-install the OS) At the first screen choose your language, at the next scree, from the menu bar select Utilities>Disk Utility, select Macintosh HD on the left and click on 'repair disk'. If anything gets fixed/changed click on repair disk again until you get a clean pass. Restart as normal from the Apple menu.
A common cause of slowdowns seems to be caused by some anti-virus programs, Trusteer's Rapport (banking security software) and apps that claim to 'speed up. enhance, boost, etc. your Mac'. The worst offender seems to be MacKeeper - do you have any such software installed?
Also, lack of RAM can cause similar slowdowns - how much do you have installed?

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http://support.apple.com/kb/ht2186
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