Corrupt HD, with Snow Leopard - no installation disk

Hi,
I'm just preparing my 18month old i7 iMac running Snow Leopard to be upgraded to Lion. A tip I saw said run the disk utility to check your disk prior to upgrading, which I did. It failed with "The volume Macintosh HD was found corrupt and needs to be repaired". It seems to be running OK, so I'm sure its nothing too serious, but nonetheless, I'd like to try and get it running 100% prior to upgrade
Full error:
Verifying volume “Macintosh HD”
Performing live verification.
Checking Journaled HFS Plus volume.
Checking extents overflow file.
Checking catalog file.
Missing thread record (id = 4514652)
Incorrect number of thread records
Checking multi-linked files.
Checking catalog hierarchy.
Invalid volume file count
(It should be 702975 instead of 702976)
Checking extended attributes file.
Checking volume bitmap.
Checking volume information.
The volume Macintosh HD was found corrupt and needs to be repaired.
Error: This disk needs to be repaired. Start up your computer with another disk (such as your Mac OS X installation disc), and then use Disk Utility to repair this disk.
I know I have to reboot my Mac to repair it, but here's the issue - I cannot find my installation disc (if my new mac actually came with one?)
Any ideas on the best way of proceeding please?
Thanks,
Darren.

Darren,
You will need to either locate the original Install Discs or replace them. If you have to replace them call AppleCare and let them know what you need, you will need the serial number and a credit card to proceed. The cost is nominal fortunately. As with all original media you should always keep it in safe place where you can easily find it. You never know when it will be needed.
After repairing the HD if it continues to report errors you should plan on replacing the HD. One thing I'd STRONGLY recommend is backing up your system prior to upgrading to Lion. I'd also recommend following the safeguards described in this Update Process link.

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APPLE APPS
Airport:
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Volume and Sound:
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• Sound now starts stuttering for no reason? When I wake my computer up from sleep and I have headphones or speaker plugged in, the audio stutters greatly. I have to unplug then re-plug my speakers or headphones to fix the issue! This is a problem I saw on many PCs due to sound cards not playing with Windows nicely, but was NEVER an issue I experienced using OS X.
• The Mac OS startup chime plays on my MacBook external speaker when I startup, even though I have speakers or headphones plugged in! It also does not matter if I had my system volume on mute when restarting • the OS seems to now decide what volume my system should be at when I start up!
Safari:
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• Freezes and crashes more often, most often when running Flash video. This occurs when I open multiple videos on YouTube, for example.
• Hogging memory even more than it used to (1GB of RAM to run the app?? Really?)
Stacks:
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iPhoto:
• Freezes completely when I go to "Export…". My Export opens on the Facebook tab of the dialogue box, and it seems the issue occurs when iPhoto can't find the source image. Rather than an error message though, I get the color wheel of death.
Spotlight/Search:
• When I search from a Finder window, sometimes I get the new feature of sortable results columns to work, but sometimes I don't. Seems arbitrary when it works and when it doesn't.
System Preferences:
• More of an annoyance, System Preferences now has to restart the first time I click on any third-party preference in "Other". Some work, most don't.
Install:
• In previous OS X upgrades, Apple gave me the option to "Backup and Install". This option was not present on Snow Leopard, so not sure what a user can d if they do not have a Time Machine backup and their install fails.
Preview:
• Preview slows down considerably when opening multiple files.
THIRD-PARTY APPS
Entourage:
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CS3:
• Slower than ever, Photoshop is running at a snail's pace.
I hope everyone can contribute to this string and get Apple to fix these problems.

I can address some of these:
Safari defaults to 64-bit mode silently, and this breaks most plug-ins (my issue was with download manager iGetter, specifically). I had to manually Get Info on the app, then switch back to 32-bit mode, which it seems Apple has not designed Snow Leopard to support properly?
All applications, to the best of my knowledge, will run in 64-bit if they include 64-bit code. With most you'll never notice, but if an application supports plugins, then you have to pay attention to whether the plug-in is available in a 64-bit version. More and more are becoming available, but not all. If you have plug-ins that aren't, you need to set the app - Safari or whatever - to 32-bit mode. This is not a bug; it's necessitated by the conversion to full-time 64-bit support. The developer of iGetter claims that an update for compatibility with Safari in 64-bit mode is under development but no time frame has been given.
Snow Leopard is perfectly capable of running 32-bit apps. You just can't mix them, running a 32-bit plugin in a 64-bit app.
Freezes and crashes more often, most often when running Flash video. This occurs when I open multiple videos on YouTube, for example.
Have you installed the latest version of Flash? Flash is almost always a bit problematical, but I've had no problems running Flash content on any site with SL.
Hogging memory even more than it used to (1GB of RAM to run the app?? Really?)
This may just be an issue of not being clear on how Mac OS X allocates memory. This article may provide some insight:
http://support.apple.com/kb/HT1342
More of an annoyance, System Preferences now has to restart the first time I click on any third-party preference in "Other". Some work, most don't.
This is normal if a preference pane has not been provided in a 64-bit version.
In previous OS X upgrades, Apple gave me the option to "Backup and Install". This option was not present on Snow Leopard
Actually it was called "archive and install" and was removed as an option as no longer necessary. The normal installation creates all necessary new files and more robustly replaces old ones, so having an archive of the old system folder was deemed to no longer be needed.
so not sure what a user can d if they do not have a Time Machine backup and their install fails.
To restore completely from a full Time Machine backup, you erase the disk using Disk Utility from the menu in the Installer, then choose to restore from a TM backup.
Preview slows down considerably when opening multiple files.
Seems to work OK for me. I've had as many as twenty open with no noticeable slowdown. But you may be opening much larger documents than I have.
Entourage froze up when I tried to simply delete one of my email accounts. The Accounts window went blank and the application froze.
Impossible to offer any advice here without knowing what version of Entourage you're using, whether it's been fully updated, and what type of email account this was.
Regards.

Corrupt HD, with Snow Leopard - no installation disk

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