Fixes for Lion 10.74 Update Freeze

I recently attempted to install an update for Lion, I believe it was 10.74.  After restarting my computer, the installation stopped as it was "moving items into place".  After waiting several hours, I forced a restart of the computer.  Now when restarting the computer it freezes on the gray loading screen with the apple logo.  Has anyone run into a similar problem and found a solution?  And if not, is there a way to somehow get the computer working again without restoring the entire computer?

Im having the same problem and its not the first time... it happens alot...
I download and once i restart and start to install it gets as far as to the writeing part and thats when it says it cant be installd.
I do it manually and all i get is
"Invalid Checksum"
Great thing when you cant even upgrade the basesoftware..........

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    com.apple.driver.AppleIntelHDGraphicsFB          7.1.8
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    com.apple.security.quarantine          1.3
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    com.apple.iokit.IOSurface          80.0.2
    com.apple.iokit.IOSerialFamily          10.0.5
    com.apple.driver.DspFuncLib          2.2.0f3
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    com.apple.driver.IOPlatformPluginLegacy          5.0.0d0
    com.apple.driver.IOPlatformPluginFamily          5.1.0d17
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    com.apple.iokit.IODVDStorageFamily          1.7
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    I've had a similar problem and found something that fixed it for me. I removed the printer because I was having some issues and then it refused to work but after a day I've managed to get it back again so here's what I did.
    1 - Download the driver from the Dell website
    http://www.dell.com/support/drivers/uk/en/ukdhs1/DriversHome/?c=uk&l=en&s=dhs&cs =ukdhs1
    2 - Run the installer and uninstall the drivers.
    3 - Run the install and re-install the drivers
    4 - Restart your Mac (I hate restarting but I blame Dell...usually it works fine for everything for weeks!)
    5 - I uninstalled and reinstalled the drivers again at this point (no real reason so try without!)
    6 - Turn on the printer and then add it in System Tools > Print and Scan
    7 - Mine added fine and found the drivers.
    Hope that helps. I couldn't find anything very useful online...especially one incredibly helpful person on another forum who posted for help then put 'it's ok I've sorted it' without explanation!
    Mark

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