Hi Linc, I've this exact problem too with the exception that Firefox works but Chrome does not.
I've followed the first steps: safemode had no problems.
I've followed the terminal commands, here is what they show:
Step 1
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/Library/Extensions/SophosNetworkInterceptor.kext
/Library/Extensions/SophosOnAccessInterceptor.kext
/System/Library/Extensions/ACard6280ATA.kext
/System/Library/Extensions/ACard62xxM.kext
/System/Library/Extensions/ACard67162.kext
/System/Library/Extensions/ACard671xSCSI.kext
/System/Library/Extensions/ACard6885M.kext
/System/Library/Extensions/ACard68xxM.kext
/System/Library/Extensions/ImmersionForceFeedback.kext
/System/Library/Extensions/LogitechForceFeedback.kext
/System/Library/Extensions/Pen Tablet.kext
/System/Library/Extensions/SophosNetworkInterceptor.kext
/System/Library/Extensions/SophosOnAccessInterceptor.kext
/System/Library/Extensions/hp_psa640_io_enabler.kext
/System/Library/Extensions/hp_qc_io_enabler.kext
Step 2
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(Blank)
Step 3
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/Library/Components:
/Library/Extensions:
SophosNetworkInterceptor.kext
SophosOnAccessInterceptor.kext
/Library/Frameworks:
Adobe AIR.framework
DRS_DPE.framework
Format_DPE.framework
HPSmartPrint.framework
MacFUSE.framework
NyxAudioAnalysis.framework
PluginManager.framework
SAVI.framework
SUMScanKit.framework
WacomMultiTouch.framework
iLifeFaceRecognition.framework
iLifeKit.framework
iLifePageLayout.framework
iLifeSQLAccess.framework
iLifeSlideshow.framework
iTunesLibrary.framework
/Library/Input Methods:
/Library/Internet Plug-Ins:
DirectorShockwave.plugin
Flash Player.plugin
Google Earth Web Plug-in.plugin
JavaAppletPlugin.plugin
Quartz Composer.webplugin
QuickTime Plugin.plugin
Unity Web Player.plugin
Unused
WacomNetscape.plugin
flashplayer.xpt
iPhotoPhotocast.plugin
nsIQTScriptablePlugin.xpt
/Library/Keyboard Layouts:
/Library/LaunchAgents:
com.avg.LinkScannerAgent.plist
com.avg.LoaderAgent.plist
com.hp.help.tocgenerator.plist
com.sophos.uiserver.plist
com.wacom.pentablet.plist
/Library/LaunchDaemons:
com.adobe.fpsaud.plist
com.apple.third_party_32b_kext_logger.plist
com.avg.apiServices.plist
com.avg.avgconfigd.plist
com.avg.avgnotifyd.plist
com.avg.avgprivd.plist
com.sophos.autoupdate.plist
com.sophos.configuration.plist
com.sophos.intercheck.plist
com.sophos.notification.plist
com.sophos.scan.plist
com.sophos.sxld.plist
com.sophos.webd.plist
/Library/PreferencePanes:
Flash Player.prefPane
LinkScannerSettings.prefPane
MacFUSE.prefPane
NTFS-3G.prefPane
PenTablet.prefPane
/Library/PrivateFrameworks:
AVGLnscServices.framework
/Library/PrivilegedHelperTools:
/Library/QuickLook:
/Library/QuickTime:
AppleIntermediateCodec.component
AppleMPEG2Codec.component
/Library/ScriptingAdditions:
AVGScriptingAdditions.osax
/Library/Spotlight:
AppleWorks.mdimporter
GBSpotlightImporter.mdimporter
LogicPro.mdimporter
Microsoft Office.mdimporter
iWork.mdimporter
/Library/StartupItems:
AvgNetShieldLoader
HP IO
/etc/mach_init.d:
dashboardadvisoryd.plist
/etc/mach_init_per_login_session.d:
/etc/mach_init_per_user.d:
Library/Address Book Plug-Ins:
SkypeABDialer.bundle
SkypeABSMS.bundle
Library/Fonts:
Library/Input Methods:
.localized
Library/Internet Plug-Ins:
Library/Keyboard Layouts:
Library/LaunchAgents:
com.apple.FolderActions.enabled.plist
com.apple.FolderActions.folders.plist
com.google.keystone.agent.plist
com.spotify.webhelper.plist
com.valvesoftware.steamclean.plist
Library/PreferencePanes:
Perian.prefPane
Library/QuickTime:
AC3MovieImport.component
Perian.component
Library/Services:
ENService.app
Library/Spotlight:
EndNote.mdimporter
Step 4
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Safari, OpenOffice.org alias, iTunesHelper, Caffeine, Caffeine, JustNotes, Dropbox, CrossOver CD Helper, TextEdit
Much appreciated in the effort you make especially putting it into laymans terms.
Cheers