How do i reformat imac hard drive and restore time machine backup?

How do I reformat my iMac internal hard drive and restore from a Time Machine backup?
I have an iMac 20" Mid 2007 with a problematic hard drive.
IntelCore 2 Duo, Processor speed 2 Ghz
800 Mhz Bus speed
4 GB RAM
250 GB Western Digital Hard Drive
10.6.3
Was getting a question mark upon booting up, so I booted from a 10.6.3 Snow Leopard CD and ran disk utility. Repair disk was interrupted with an error message. 'Disk utility can't repair disk. Backup files, reformat disk and restore backed up files.'
1. Should I select Erase, Mac OS Extended Journaled, Erase?
2. If I do this, won't I lose my networkability, and therefore lose access to Time Machine backups?
3. If it were you, would you go ahead and replace the hard drive? Not sure I should trust this hard drive!
4. If I need to replace the hard drive, can you send instructions?
Thanks!

Clean Install of Snow Leopard
     1. Boot the computer using the Snow Leopard Installer Disc or the Disc 1 that came
         with your computer.  Insert the disc into the optical drive and restart the computer.
         After the chime press and hold down the  "C" key.  Release the key when you see
         a small spinning gear appear below the dark gray Apple logo.
     2. After the installer loads select your language and click on the Continue
         button. When the menu bar appears select Disk Utility from the Utilities menu.
         After DU loads select the hard drive entry from the left side list (mfgr.'s ID and drive
         size.)  Click on the Partition tab in the DU main window.  Set the number of
         partitions to one (1) from the Partitions drop down menu, click on Options button
         and select GUID, click on OK, then set the format type to MacOS Extended
         (Journaled, if supported), then click on the Apply button.
     3. When the formatting has completed quit DU and return to the installer.  Proceed
         with the OS X installation and follow the directions included with the installer.
     4. When the installation has completed your computer will Restart into the Setup
         Assistant. Be sure you configure your initial admin account with the exact same
         username and password that you used on your old drive. After you finish Setup
         Assistant will complete the installation after which you will be running a fresh
         install of OS X.  You can now begin the update process by opening Software
         Update and installing all recommended updates to bring your installation current.
Download and install Mac OS X 10.6.8 Update Combo v1.1.
If you have your Time Machine backup drive connected, then you can use Setup Assistant to migrate your Home folder, application support files, and third-party applications and system preference files. I recommend doing this via the Setup Assistant when the option appears.

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    Other details:
    My external drive is a WD 1TB drive. The partition for the Time Machine Backup is formatted as Mac OS Extended (Journaled), as is my Macintosh HD. The Partition Map Scheme on the external drive is GUID Partition Table.
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    The Ruby folder is probably hidden. That is why you don't see it.
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