How to repair my hard drive

Hello everyone, happy holidays
I have a Macbook Pro (4 years old)
My main problem is this: My disk drive does not seem to read CD/DVD's anymore.
Background: I have recently tried to install snow leopard in order to install an itouch. however, everytime I insert the disk, it spins for a while, then gets kicked out. i tried running the first aid repair program in order to verify my mac hard drive. I got the following message:
Verifying volume “Macintosh HD”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Checking multi-linked files.
Checking Catalog hierarchy.
Checking Extended Attributes file.
Checking volume bitmap.
Checking volume information.
Volume Header needs minor repair
The volume Macintosh HD needs to be repaired.
Error: The underlying task reported failure on exit
1 HFS volume checked
Volume needs repair
However, the repair button is not selectable. More so, I'm not even sure this is the main problem.
The main question: Does this sound as though I need to physically replace the disk drive? If this is just a hard drive repair thing, how do I run the repair program?

Disconnect all peripherals from your computer. Boot from your install disc (Tiger?) & run _*Repair Disk*_ from the utility menu. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
Select your language.
Once on the desktop, select Utility in the menu bar.
Select *Disk Utility.*
Select the disk or volume in the list of disks and volumes, and then click *First Aid.*
Click _*Repair Disk.*_
Restart your computer when done.
Repair permissions after you reach the desktop-http://docs.info.apple.com/article.html?artnum=25751 and restart your computer.

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