Windows 7 on iMac experiencing frequent screen-wrap?

I installed Windows 7 on my iMac with no issues, and the first few times it loaded up just fine.  However now I experience frequent screen-wrap, or screen issues in general when booting up into windows. 
I'll start up the computer, and sometimes the left edge of the Windows start-up screen will start in the middle of the iMac screen, wrapping around with the far right edge coming back to the center from the left side (I hope I'm explaining this alright).  Sometimes it'll wrap from top to bottom, and sometime I can only see the very bottom of the start up screen up at the very top of the actual iMac display.  I end up just doing a hard restart with the button on the back until the screen is properly positioned on my iMac.  Sometimes it takes a few restarts, sometimes it comes up correctly the first time. After it loads up correctly, I have no issues until it comes to turning it back on again after any restarts or shutting down for the night.  I've tried running all sorts of anti-virus, but I haven't found anything (I'm not sure where I would have picked anything up from in the first place).
I've been seeing many posts regarding a black screen during/after installation, but I don't think that's my issue since I can run windows just fine when I can see it.  Is there any way to fix this?
Thanks.  (This is my first post, so please let me know if I'm not explaining this very well)

Ah sorry, I can try to do a screen shot, but is it possible to do one while the computer is still starting up? As for model, I know it's a 27 inch iMac that I bought brand new about 4 years ago. I'll have to log of and log onto the Mac OS side, as I'm on the windows side right now.
Thanks

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    0x9907e000 - 0x990a0fff  libc++abi.dylib (24.4) <06479DA4-BC23-34B6-BAFC-A885814261D0> /usr/lib/libc++abi.dylib
    0x990a1000 - 0x990edfff  libcorecrypto.dylib (106.2) <20EBADBA-D6D6-36F0-AE80-168E9AF13DB6> /usr/lib/system/libcorecrypto.dylib
    0x990ee000 - 0x990fcff3  libsystem_network.dylib (77.10) <7FBF5A15-97BA-3721-943E-E77F0C40DBE1> /usr/lib/system/libsystem_network.dylib
    0x9912f000 - 0x9915bff7  libsystem_info.dylib (406.17) <AA5611DB-A944-3072-B6BE-ACAB08689547> /usr/lib/system/libsystem_info.dylib
    0x996a8000 - 0x996d5ffe  libsystem_m.dylib (3022.6) <9975D9C3-3B71-38E3-AA21-C5C5F9D9C431> /usr/lib/system/libsystem_m.dylib
    0x99bc8000 - 0x99bc9fff  libDiagnosticMessagesClient.dylib (8) <39B3D25A-148A-3936-B800-0D393A00E64F> /usr/lib/libDiagnosticMessagesClient.dylib
    0x9a18e000 - 0x9a24bfeb  libsystem_c.dylib (825.25) <B1F6916A-F558-38B5-A18C-D9733625FDC9> /usr/lib/system/libsystem_c.dylib
    0x9a2d8000 - 0x9a2e0fff  libcopyfile.dylib (89) <4963541B-0254-371B-B29A-B6806888949B> /usr/lib/system/libcopyfile.dylib
    0x9a2e1000 - 0x9a2f3fff  libbsm.0.dylib (32) <DADD385E-FE53-3458-94FB-E316A6345108> /usr/lib/libbsm.0.dylib
    0x9a3f9000 - 0x9a413ffc  libsystem_kernel.dylib (2050.18.24) <C17D49D0-7961-3B67-B443-C788C6E5AA76> /usr/lib/system/libsystem_kernel.dylib
    External Modification Summary:
      Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
      Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
      Calls made by all processes on this machine:
    task_for_pid: 303
    thread_create: 1
    thread_set_state: 0
    VM Region Summary:
    ReadOnly portion of Libraries: Total=41.8M resident=27.1M(65%) swapped_out_or_unallocated=14.7M(35%)
    Writable regions: Total=10.1M written=16K(0%) resident=52K(1%) swapped_out=0K(0%) unallocated=10.0M(99%)
    REGION TYPE                 
    VIRTUAL
    ===========                 
    =======
    Memory tag=35                 
    3424K
    Stack                         
    64.0M
    __DATA                        
    3468K
    __DATA/__OBJC                   
    52K
    __HASP_SRM_3_50                 
    64K
    __IMPORT                         
    8K
    __LINKEDIT                    
    31.2M
    __PAGEZERO                       
    4K
    __TD                             
    4K
    __TEXT                        
    10.6M
    __UNICODE                      
    544K
    mapped file                  
    168.4M
    shared memory                   
    12K
    ===========                 
    =======
    TOTAL                        
    281.6M

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