Update to Mountain Lion 10.8.5 has killed my wifi access. Help needed.

I have a  late 2008 aluminium MacBook. Everything worked fine until I downloaded the update on wifi, restarted, & now I cannot turn my wifi on.
Help please!  I need to use my MacBook tonight.

Information.
Troubleshooting Wi-Fi issues in OS X
Wireless Connection Problems - Fix
Wireless Connection Problems - Fix (2)
Wireless Connection Problems - Fix (3)
Wireless Connection Problems - Fix (4)
Wireless Diagnostics - About

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    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
    Startup Items:
              HP IO - Path: /Library/StartupItems/HP IO
              HP Trap Monitor - Path: /Library/StartupItems/HP Trap Monitor
              PenTabletDriver - Path: /Library/StartupItems/PenTabletDriver
    System Software:
              OS X 10.8.4 (12E55) - Uptime: 0 days 0:15:20
    Disk Information:
              FUJITSU MJA2250BH FFS G1 disk0 : (250.06 GB)
                        disk0s1 (disk0s1) <not mounted>: 209.7 MB
                        Macintosh HD (disk0s2) /: 249.2 GB (41.93 GB free)
              HL-DT-ST DVDRW  GS23N 
    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:
              at.obdev.nke.LittleSnitch          (2.5.4)
    Problem System Launch Daemons:
    Problem System Launch Agents:
    Launch Daemons:
              [loaded] at.obdev.littlesnitchd.plist
              [loaded] com.adobe.fpsaud.plist
              [loaded] com.adobe.SwitchBoard.plist
              [loaded] com.autodesk.backburner_manager.plist
              [loaded] com.autodesk.backburner_server.plist
              [loaded] com.autodesk.backburner_start.plist
              [loaded] com.google.keystone.daemon.plist
              [loaded] com.intego.commonservices.daemon.plist
              [loaded] com.intego.commonservices.icalserver.plist
              [loaded] com.intego.commonservices.metrics.kschecker.plist
              [loaded] com.intego.netupdate.daemon.plist
              [loaded] com.intego.task.manager.daemon.plist
              [failed] com.intego.VirusBarrier.daemon.plist
              [failed] com.intego.VirusBarrier.logger.daemon.plist
              [failed] com.intego.VirusBarrier.scanner.daemon.plist
              [loaded] com.novatelwireless.mobilink3.plist
              [loaded] com.novatelwireless.NvtlServer.plist
              [failed] com.starfield.backupservice.plist
              [loaded] com.wdc.WDDMservice.plist
              [loaded] com.wdc.WDSmartWareServer.plist
    Launch Agents:
              [loaded] at.obdev.LittleSnitchNetworkMonitor.plist
              [loaded] at.obdev.LittleSnitchUIAgent.plist
              [not loaded] com.adobe.AAM.Updater-1.0.plist
              [loaded] com.divx.dms.agent.plist
              [loaded] com.divx.update.agent.plist
              [loaded] com.epson.eventmanager.agent.plist
              [loaded] com.google.keystone.agent.plist
              [loaded] com.intego.commonservices.statusitem.plist
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              DivXBrowserPlugin.plugin
              Flash Player.plugin
              FlashPlayer-10.6.plugin
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              o1dbrowserplugin.plugin
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              fileEditTool64_15.plugin
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                   4%          WindowServer
                   1%          EtreCheck
                   1%          Little Snitch Network Monitor
                   1%          hidd
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                   0%          mds
                   0%          DivXMediaServer
                   0%          mDNSResponder
                   0%          lsd
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              123 MB             Safari
              74 MB              Dock
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              41 MB              coreservicesd
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              1.23 GB            Active RAM
              164 MB             Inactive RAM
              525 MB             Wired RAM
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    I've tested these instructions only with the Safari web browser. If you use another browser, they may not work as described.
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