iMac running Yosemite keeps crashing

My iMac (2014 5K, running latest version of Yosemite) keeps crashing.  Staff at Apple Forums say this is due to a Symantec issue (I have Norton 360 installed).  Below is a crash dump.  What do I need to do to get this fixed?  Thanks!

 

Anonymous UUID:       D4508373-3B51-A48A-DD18-3EB86113C7FB

Fri Apr 24 21:58:06 2015

*** Panic Report ***
panic(cpu 0 caller 0xffffff7f98761732): "sfree on invalid allocation at 0xffffff806b6d18b0"@/SourceCache/Sandbox_executables/Sandbox-358.20.5/src/kext/smalloc.c:224
Backtrace (CPU 0), Frame : Return Address
0xffffff83c4fbb540 : 0xffffff8017b2bda1 
0xffffff83c4fbb5c0 : 0xffffff7f98761732 
0xffffff83c4fbb5f0 : 0xffffff7f987540c6 
0xffffff83c4fbb610 : 0xffffff7f98761e7f 
0xffffff83c4fbb630 : 0xffffff7f987597c4 
0xffffff83c4fbb670 : 0xffffff7f98758c96 
0xffffff83c4fbb6a0 : 0xffffff801812fe44 
0xffffff83c4fbb6c0 : 0xffffff8017fa40bd 
0xffffff83c4fbb6e0 : 0xffffff8017d2dff2 
0xffffff83c4fbb730 : 0xffffff8017d496c6 
0xffffff83c4fbbb50 : 0xffffff8017fa01f2 
0xffffff83c4fbbbb0 : 0xffffff8017d63a57 
0xffffff83c4fbbc00 : 0xffffff8017d5bcb3 
0xffffff83c4fbbf20 : 0xffffff8017d50f6a 
0xffffff83c4fbbf50 : 0xffffff801804ba86 
0xffffff83c4fbbfb0 : 0xffffff8017c35376 
      Kernel Extensions in backtrace:
         com.apple.kext.AppleMatch(1.0d1)[37AE7F31-8D85-37FE-AA63-2070F6FE115C]@0xffffff7f98753000->0xffffff7f98757fff
         com.apple.security.sandbox(300.0)[3190243F-43C7-37F3-8E38-999602CED46C]@0xffffff7f98758000->0xffffff7f9876efff
            dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[E185D251-D178-37FC-8523-68013F3308B7]@0xffffff7f98746000
            dependency: com.apple.kext.AppleMatch(1.0.0d1)[37AE7F31-8D85-37FE-AA63-2070F6FE115C]@0xffffff7f98753000

BSD process name corresponding to current thread: SymDaemon

Mac OS version:
14D136

Kernel version:
Darwin Kernel Version 14.3.0: Mon Mar 23 11:59:05 PDT 2015; root:xnu-2782.20.48~5/RELEASE_X86_64
Kernel UUID: 4B3A11F4-77AA-3D27-A22D-81A1BC5B504D
Kernel slide:     0x0000000017800000
Kernel text base: 0xffffff8017a00000
__HIB  text base: 0xffffff8017900000
System model name: iMac15,1 (Mac-FA842E06C61E91C5)

System uptime in nanoseconds: 38060699386822
last loaded kext at 1204462296434: com.apple.filesystems.smbfs    3.0.1 (addr 0xffffff7f9b0af000, size 389120)
last unloaded kext at 239986940945: com.apple.iokit.IOAHCIPassThrough    1.0.3 (addr 0xffffff7f98fa4000, size 36864)
loaded kexts:
com.symantec.kext.SymAPComm    12.7.1f4
com.symantec.kext.fw    5.3.1f4
com.symantec.kext.ips    3.10.2f23
com.symantec.kext.pf    5.7.1f4
com.symantec.kext.internetSecurity    5.4f4
com.apple.filesystems.smbfs    3.0.1
com.apple.filesystems.exfat    1.4
com.apple.driver.AppleBluetoothMultitouch    85.3
com.apple.driver.AudioAUUC    1.70
com.apple.filesystems.autofs    3.0
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport    4.3.4f4
com.apple.driver.AGPM    110.19.5
com.apple.driver.ApplePlatformEnabler    2.2.0d4
com.apple.driver.X86PlatformShim    1.0.0
com.apple.iokit.IOBluetoothSerialManager    4.3.4f4
com.apple.driver.AppleOSXWatchdog    1
com.apple.driver.AppleMikeyHIDDriver    124
com.apple.driver.AppleMikeyDriver    272.18
com.apple.driver.AppleHDA    272.18
com.apple.driver.AppleGraphicsDevicePolicy    3.7.7
com.apple.driver.AppleUpstreamUserClient    3.6.1
com.apple.kext.AMDFramebuffer    1.3.2
com.apple.iokit.IOUserEthernet    1.0.1
com.apple.Dont_Steal_Mac_OS_X    7.0.0
com.apple.driver.AppleHWAccess    1
com.apple.AMDRadeonX4000    1.3.2
com.apple.driver.AppleIntelHD5000Graphics    10.0.6
com.apple.driver.AppleHV    1
com.apple.driver.AppleThunderboltIP    2.0.2
com.apple.driver.AppleSMCLMU    2.0.7d0
com.apple.driver.AppleLPC    1.7.3
com.apple.driver.AppleIntelSlowAdaptiveClocking    4.0.0
com.apple.driver.AppleMCCSControl    1.2.11
com.apple.kext.AMD9000Controller    1.3.2
com.apple.driver.AppleIntelFramebufferAzul    10.0.6
com.apple.iokit.SCSITaskUserClient    3.7.5
com.apple.driver.AppleRAID    4.0.6
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
com.apple.BootCache    36
com.apple.driver.AppleUSBHub    705.4.2
com.apple.driver.XsanFilter    404
com.apple.iokit.IOAHCIBlockStorage    2.7.1
com.apple.driver.AppleSDXC    1.6.5
com.apple.iokit.AppleBCM5701Ethernet    10.1.3
com.apple.driver.AirPort.Brcm4360    930.37.3
com.apple.driver.AppleAHCIPort    3.1.2
com.apple.driver.AppleUSBXHCI    710.4.11
com.apple.driver.AppleACPIButtons    3.1
com.apple.driver.AppleRTC    2.0
com.apple.driver.AppleHPET    1.8
com.apple.driver.AppleSMBIOS    2.1
com.apple.driver.AppleACPIEC    3.1
com.apple.driver.AppleAPIC    1.7
com.apple.nke.applicationfirewall    161
com.apple.security.quarantine    3
com.apple.security.TMSafetyNet    8
com.apple.driver.IOBluetoothHIDDriver    4.3.4f4
com.apple.driver.AppleMultitouchDriver    263.9.1
com.apple.kext.triggers    1.0
com.apple.iokit.IOBluetoothHostControllerUSBTransport    4.3.4f4
com.apple.iokit.IOSerialFamily    11
com.apple.driver.AppleUSBHIDKeyboard    176.2
com.apple.driver.AppleHIDKeyboard    176.2
com.apple.driver.DspFuncLib    272.18
com.apple.kext.OSvKernDSPLib    1.15
com.apple.iokit.IOUSBUserClient    705.4.0
com.apple.iokit.IOBluetoothFamily    4.3.4f4
com.apple.driver.AppleGraphicsControl    3.10.22
com.apple.iokit.IOSurface    97.4
com.apple.iokit.IOUSBHIDDriver    705.4.0
com.apple.iokit.IONDRVSupport    2.4.1
com.apple.driver.AppleHDAController    272.18
com.apple.iokit.IOHDAFamily    272.18
com.apple.iokit.IOAudioFamily    203.3
com.apple.vecLib.kext    1.2.0
com.apple.driver.AppleSMBusPCI    1.0.12d1
com.apple.driver.X86PlatformPlugin    1.0.0
com.apple.driver.AppleSMC    3.1.9
com.apple.driver.IOPlatformPluginFamily    5.9.1d7
com.apple.iokit.IOSlowAdaptiveClockingFamily    1.0.0
com.apple.driver.AppleThunderboltEDMSink    4.0.2
com.apple.driver.AppleSMBusController    1.0.13d1
com.apple.kext.AMDSupport    1.3.2
com.apple.AppleGraphicsDeviceControl    3.10.22
com.apple.iokit.IOAcceleratorFamily2    156.14
com.apple.iokit.IOGraphicsFamily    2.4.1
com.apple.driver.AppleUSBMergeNub    705.4.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice    3.7.5
com.apple.iokit.IOBDStorageFamily    1.7
com.apple.iokit.IODVDStorageFamily    1.7.1
com.apple.iokit.IOCDStorageFamily    1.7.1
com.apple.iokit.IOUSBMassStorageClass    3.7.2
com.apple.iokit.IOSCSIArchitectureModelFamily    3.7.5
com.apple.driver.AppleUSBComposite    705.4.9
com.apple.driver.AppleThunderboltDPInAdapter    4.0.6
com.apple.driver.AppleThunderboltDPOutAdapter    4.0.6
com.apple.driver.AppleThunderboltDPAdapterFamily    4.0.6
com.apple.driver.AppleThunderboltPCIUpAdapter    2.0.2
com.apple.driver.AppleThunderboltPCIDownAdapter    2.0.2
com.apple.driver.CoreStorage    471.20.7
com.apple.driver.AppleThunderboltNHI    3.1.7
com.apple.iokit.IOThunderboltFamily    4.2.2
com.apple.iokit.IOEthernetAVBController    1.0.3b3
com.apple.iokit.IO80211Family    730.60
com.apple.driver.mDNSOffloadUserClient    1.0.1b8
com.apple.iokit.IONetworkingFamily    3.2
com.apple.iokit.IOAHCIFamily    2.7.5
com.apple.iokit.IOUSBFamily    720.4.4
com.apple.driver.AppleEFINVRAM    2.0
com.apple.iokit.IOHIDFamily    2.0.0
com.apple.driver.AppleEFIRuntime    2.0
com.apple.iokit.IOSMBusFamily    1.1
com.apple.security.sandbox    300.0
com.apple.kext.AppleMatch    1.0.0d1
com.apple.driver.AppleKeyStore    2
com.apple.driver.AppleMobileFileIntegrity    1.0.5
com.apple.driver.AppleCredentialManager    1.0
com.apple.driver.DiskImages    396
com.apple.iokit.IOStorageFamily    2.0
com.apple.iokit.IOReportFamily    31
com.apple.driver.AppleFDEKeyStore    28.30
com.apple.driver.AppleACPIPlatform    3.1
com.apple.iokit.IOPCIFamily    2.9
com.apple.iokit.IOACPIFamily    1.4
com.apple.kec.Libm    1
com.apple.kec.pthread    1
com.apple.kec.corecrypto    1.0