BSOD crashes randomly, APC_INDEX_MISMATCH

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Dump File : 071812-48204-01.dmp
Crash Time : 7/18/2012 10:46:00 PM
Bug Check String : APC_INDEX_MISMATCH
Bug Check Code : 0x00000001
Parameter 1 : 00000000`776e186a
Parameter 2 : 00000000`00000000
Parameter 3 : 00000000`ffff0000
Parameter 4 : fffff880`0ae00ca0
Caused By Driver : SYMEVENT64x86.SYS
Caused By Address : SYMEVENT64x86.SYS+7d80ca0
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+7f1c0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\071812-48204-01.dmp
Processors Count : 2
Major Version : 15
Minor Version : 7601
Dump File Size : 287,036
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Crashes randomly, happened a few times today. Updated all my drivers. Can anyone help me?

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