Why my 21.5 imac the screen checks when  i play youtube videos

why my 21.5 imac the screen checks when  i play youtube videos

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    https://skydrive.live.com/redir?resid=E99942A51570F4B3!290&authkey=!AJz16JywA8GYfu8&ithint=folder%2c

    * Bugcheck Analysis *
    BAD_POOL_CALLER (c2)
    The current thread is making a bad pool request. Typically this is at a bad IRQL level or double freeing the same allocation, etc.
    Arguments:
    Arg1: 0000000000000007, Attempt to free pool which was already freed
    Arg2: 0000000000001205, (reserved)
    Arg3: 0000000000000000, Memory contents of the pool block
    Arg4: ffffe00001ec6318, Address of the block of pool being deallocated
    Debugging Details:
    POOL_ADDRESS: ffffe00001ec6318
    FREED_POOL_TAG: Mdl
    BUGCHECK_STR: 0xc2_7_Mdl
    CUSTOMER_CRASH_COUNT: 1
    DEFAULT_BUCKET_ID: WIN8_DRIVER_FAULT
    PROCESS_NAME: dwm.exe
    CURRENT_IRQL: 2
    TAG_NOT_DEFINED_c000000f: FFFFF8004250FFB0
    LAST_CONTROL_TRANSFER: from fffff80040aa0338 to fffff8004095b0a0
    STACK_TEXT:
    fffff800`4250eb68 fffff800`40aa0338 : 00000000`000000c2 00000000`00000007 00000000`00001205 00000000`00000000 : nt!KeBugCheckEx
    fffff800`4250eb70 fffff800`00c6af67 : fffff800`4250ed50 fffff800`00f42af3 00000000`00000000 00000000`00000000 : nt!ExDeferredFreePool+0xbb8
    fffff800`4250ec40 fffff800`00ff20ad : fffff800`4250eca1 00000000`00000001 ffffe000`02ff5590 00000000`00000002 : NETIO! ?? ::FNODOBFM::`string'+0x797c
    fffff800`4250ec90 fffff800`00c36224 : 00000000`00000000 00000000`00000003 00000000`00000003 00000000`00000000 : tcpip! ?? ::FNODOBFM::`string'+0x3e366
    fffff800`4250ece0 fffff800`00f49700 : ffffe000`02b05040 00000000`00000001 ffffe000`02837a60 ffffe000`008a3510 : NETIO!NetioDereferenceNetBufferListChain+0xe4
    fffff800`4250eda0 fffff800`00f43c7c : ffffe000`01ed9034 00000000`00000000 ffffe000`00fb5a00 ffffe000`00f5a260 : tcpip!TcpFlushDelay+0x1b0
    fffff800`4250ef30 fffff800`00f538ff : ffffe000`0140bf00 fffff800`42505000 fffff800`4250b6c7 ffffe000`0040b6c7 : tcpip!TcpPreValidatedReceive+0x40c
    fffff800`4250f030 fffff800`00f52ad3 : fffff800`00000000 ffffe000`00546be0 ffffe000`00408320 ffffe000`00546be0 : tcpip!IppDeliverListToProtocol+0x4f
    fffff800`4250f0f0 fffff800`00f531ac : ffffe000`0040b000 ffff4732`00000202 fffff800`4250f558 fffff800`4250f1f8 : tcpip!IppProcessDeliverList+0x63
    fffff800`4250f190 fffff800`00f50829 : ffff4732`ffffffff ffffe000`009e8890 ffffe000`01423000 00000000`00000000 : tcpip!IppReceiveHeaderBatch+0x1fc
    fffff800`4250f2c0 fffff800`00f526ac : ffffe000`02838cb0 00000000`00000000 fffff800`4250f601 ffffe000`01cb0500 : tcpip!IppFlcReceivePacketsCore+0x69a
    fffff800`4250f650 fffff800`00f4ff93 : ffffe000`02830002 00000000`00000000 fffff800`00f4fdd0 444d0a59`00000001 : tcpip!FlpReceiveNonPreValidatedNetBufferListChain+0x31c
    fffff800`4250f730 fffff800`408a7fa9 : ffff0000`ffffffff 00000000`00000000 ffffe000`0143ef10 fffff800`4250a000 : tcpip!FlReceiveNetBufferListChainCalloutRoutine+0xd3
    fffff800`4250f860 fffff800`00f5297e : fffff800`00f4fec0 fffff800`4250f9e0 ffffe000`0283e910 fffff800`4250fa40 : nt!KeExpandKernelStackAndCalloutInternal+0xe9
    fffff800`4250f9b0 fffff800`00a835fe : 00000000`00000000 fffff800`4250fa91 00000000`00000003 ffffe000`018031b0 : tcpip!FlReceiveNetBufferListChain+0xbe
    fffff800`4250fa30 fffff800`00ae3c4f : 00000000`00000002 00000000`00000001 fffff800`00000000 fffff800`00000003 : ndis!ndisMIndicateNetBufferListsToOpen+0x11e
    fffff800`4250faf0 fffff800`00ae5867 : ffffe000`0188b1a0 00000000`00000000 fffff800`4250fe01 ffffe000`00000003 : ndis!ndisDoPeriodicReceivesIndication+0x39f
    fffff800`4250fb80 fffff800`00a9f2cc : fffffff6`00010302 ffffe000`00f71240 fffff800`4250fce0 fffff800`4250fe70 : ndis!ndisPeriodicReceivesWorker+0x63
    fffff800`4250fbb0 fffff800`4088ee90 : fffff800`40afef00 fffff800`4250fe70 ffffe000`02c1d880 ffffe000`02c1d880 : ndis!ndisPeriodicReceivesTimer+0xbc
    fffff800`4250fbe0 fffff800`4088e111 : ffffe000`0274c880 00000000`a29c1836 fffff800`40afc180 ffffe000`00000000 : nt!KiExecuteAllDpcs+0x1b0
    fffff800`4250fd30 fffff800`4095e1d5 : 00000000`00000000 fffff800`40afc180 fffff800`40fe1900 00000000`00000004 : nt!KiRetireDpcList+0xe1
    fffff800`4250ffb0 fffff800`4095dfd9 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KxRetireDpcList+0x5
    ffffd000`22c5ec00 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KiDispatchInterruptContinue
    STACK_COMMAND: kb
    FOLLOWUP_IP:
    NETIO! ?? ::FNODOBFM::`string'+797c
    fffff800`00c6af67 90 nop
    SYMBOL_STACK_INDEX: 2
    SYMBOL_NAME: NETIO! ?? ::FNODOBFM::`string'+797c
    FOLLOWUP_NAME: MachineOwner
    MODULE_NAME: NETIO
    IMAGE_NAME: NETIO.SYS
    DEBUG_FLR_IMAGE_TIMESTAMP: 5215f7e4
    BUCKET_ID_FUNC_OFFSET: 797c
    FAILURE_BUCKET_ID: 0xc2_7_Mdl__NETIO!_??_::FNODOBFM::_string_
    BUCKET_ID: 0xc2_7_Mdl__NETIO!_??_::FNODOBFM::_string_
    Followup: MachineOwner
    0: kd> lmvm NETIO
    start end module name
    fffff800`00c35000 fffff800`00cae000 NETIO (pdb symbols)
    Loaded symbol image file: NETIO.SYS
    Mapped memory image file:
    Image path: \SystemRoot\system32\drivers\NETIO.SYS
    Image name: NETIO.SYS
    Timestamp: Thu Aug 22 19:37:08 2013 (5215F7E4)
    CheckSum: 0007A220
    ImageSize: 00079000
    File version: 6.3.9600.16384
    Product version: 6.3.9600.16384
    File flags: 0 (Mask 3F)
    File OS: 40004 NT Win32
    File type: 3.6 Driver
    File date: 00000000.00000000
    Translations: 0409.04b0
    CompanyName: Microsoft Corporation
    ProductName: Microsoft® Windows® Operating System
    InternalName: netio.sys
    OriginalFilename: netio.sys
    ProductVersion: 6.3.9600.16384
    FileVersion: 6.3.9600.16384 (winblue_rtm.130821-1623)
    FileDescription: Network I/O Subsystem
    LegalCopyright: © Microsoft Corporation. All rights reserved.
    Hi,
    According to  the "Bugcheck Analysis", it is related to your network (NIC) driver or the wireless (WiFi) drivers.
    As you said, I think it may be caused by PCI wireless adapter driver.
    I suggest you uninstall this driver to narrow down the issue.
    Regards,
    Kelvin hsu
    TechNet Community Support

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