Cannot access safe boot for Mac Air running Snow Leopard any suggestion please?

Mac Air - Mid 2011 (79gig free space). Running Snow Leopard 10.6 + all updates installed to-date. Last update was iTunes 98m file which was installed 4 days ago.
Unit has progressively slowed up, starting with intermittent freezing of cursor, which appears to have started not long after connecting iPhone 5 running current iOS.
Have accessed Safe Boot and ran drive utility check, all ok.
Received error message after drive check stating, "(AppleUsbEthernetHost.text) incorrectly installed".
Have subsequently tried accessing Safe Boot again to try and reset permissions, but can not access as unit constantly freezes at Login page.
Have followed Apple support recommendations to access Safe Boot, but to no avail.
Have seen forum references to the above error relating to iOS mobile devices causing problems with earlier versions of iTunes updates. 
Any suggestions as to how to proceed from here would be appreciated ?
Ivy

I suggest you backup your files, if possible, then do the following:
Clean Install of Snow Leopard
Be sure to make a backup first because the following procedure will erase
the drive and everything on it.
     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.
Reinstall your third-party software from the original media. Restore your data from the backup.

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