Error message during Mavericks install

I downloaded successfully a copy of the Install OS X Mavericks app from the Apple App store to my MacBook Pro. If I try to install Mavericks to my computer, I initially get the message, "preparing to install. Your computer will restart automatically". But instead of restarting, I get the following error message: "This copy of the Install OS X Mavericks application can't be verified. It may have been corrupted or tampered with during downloading. Delete this copy of the application, and go to the Purchases page of the Mac App Store to download a new copy."
I've deleted and re-downloaded the app 3-4 times and keep getting the same error message. I was able to install Mavericks successfully to my iMac, which is a year older than my MacBook Pro, so I can't figure out what the problem is. Anyone have any ideas how to fix this issue?

I ran EtreCheck and this is the report it spit out:
Hardware Information
    MacBook Pro (15-inch, 2.53GHz, Mid 2009)
    MacBook Pro - model: MacBookPro5,4
    1 2.53 GHz Intel Core 2 Duo CPU: 2 cores
    4 GB RAM
Video Information:
    NVIDIA GeForce 9400M - VRAM: 256 MB
System Software:
    Mac OS X 10.6.8 (10K549) - Uptime: 12 days 0:28:31
Disk Information:
    Hitachi HTS545025B9SA02 disk0 : (232.89 GB)
        (null) (disk0s1) <not mounted>: 200 MB
        Macintosh HD (disk0s2) /: 232.57 GB (133.08 GB free)
    MATSHITADVD-R   UJ-868
USB Information:
    Apple Inc. Built-in iSight
    Apple Internal Memory Card Reader
    Apple Inc. Apple Internal Keyboard / Trackpad
    Apple Computer, Inc. IR Receiver
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
FireWire Information:
Thunderbolt Information:
Kernel Extensions:
    com.sophos.nke.swi    (9.0.3 - SDK 10.8)
    com.sophos.kext.sav    (9.0.3 - SDK 10.7)
Problem System Launch Daemons:
    [System]    org.samba.winbindd.plist 3rd-Party support link
Problem System Launch Agents:
Launch Daemons:
    [System]    com.adobe.fpsaud.plist 3rd-Party support link
    [System]    com.leapfrog.connect.shell.plist 3rd-Party support link
    [System]    com.sophos.autoupdate.plist 3rd-Party support link
    [System]    com.sophos.configuration.plist 3rd-Party support link
    [System]    com.sophos.intercheck.plist 3rd-Party support link
    [System]    com.sophos.notification.plist 3rd-Party support link
    [System]    com.sophos.scan.plist 3rd-Party support link
    [System]    com.sophos.sxld.plist 3rd-Party support link
    [System]    com.sophos.webd.plist 3rd-Party support link
Launch Agents:
    [System]    com.hp.help.tocgenerator.plist 3rd-Party support link
    [System]    com.sophos.uiserver.plist 3rd-Party support link
User Launch Agents:
    [not loaded]    [email protected]
    [not loaded]    com.google.keystone.agent.plist 3rd-Party support link
    [not loaded]    com.macpaw.CleanMyMac.helperTool.plist 3rd-Party support link
    [not loaded]    com.macpaw.CleanMyMac.volumeWatcher.plist 3rd-Party support link
User Login Items:
    Monitor
    iTunesHelper
Internet Plug-ins:
    JavaAppletPlugin: Version: 13.9.8 - SDK 10.6 Outdated! Update
    FlashPlayer-10.6: Version: 12.0.0.38 - SDK 10.6 3rd-Party support link
    EPPEX Plugin: Version: 4.1.0.0 3rd-Party support link
    Flash Player: Version: 12.0.0.38 - SDK 10.6 3rd-Party support link
    QuickTime Plugin: Version: 7.6.6
    WidevineMediaOptimizer: Version: 6.0.0.12607 - SDK 10.7 3rd-Party support link
    Google Earth Web Plug-in: Version: 7.1 3rd-Party support link
    Silverlight: Version: 4.1.10329.0 3rd-Party support link
    iPhotoPhotocast: Version: 7.0
User Internet Plug-ins:
    WebEx64: Version: 1.0 - SDK 10.6 3rd-Party support link
    CitrixOnlineWebDeploymentPlugin: Version: 1.0.105 3rd-Party support link
    thinkorswim plugin_x86_64: Version: thinkorswim_x86_64 1.0.0.0 - SDK 10.7 3rd-Party support link
    tossc plugin_x86_64: Version: TOS Sharing Center plugin_x86_64 1.0.0.0 - SDK 10.7 3rd-Party support link
3rd Party Preference Panes:
    Flash Player 3rd-Party support link
Bad Fonts:
    None
Old Applications:
    None
Time Machine:
    Time Machine information requires OS X 10.7 "Lion" or later.
Top Processes by CPU:
         4%    WindowServer
         3%    EtreCheck
         0%    mds
         0%    firefox
         0%    ps
Top Processes by Memory:
    274 MB    firefox
    139 MB    SophosScanD
    135 MB    InterCheck
    86 MB    mds
    66 MB    WindowServer
Virtual Memory Information:
    1.77 GB    Free RAM
    1.00 GB    Active RAM
    523 MB    Inactive RAM
    476 MB    Wired RAM
    1.09 GB    Page-ins
    4 MB    Page-outs

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