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crash after changing video card (from nvidia to amd radeon)

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    crash after changing video card (from nvidia to amd radeon)

    hello, like the title says, after changing my video card, i'm having problems with all the projects that i have in my hard disk.

    i try to launch the unreal editor and it crashes, it says "udk stop working" and this is all i have in the log file

    Log: Log file open, 05/07/13 19:06:16
    Init: WinSock: version 1.1 (2.2), MaxSocks=32767, MaxUdp=65467
    DevConfig: GConfig::Find has loaded file:  ..\..\Engine\Config\ConsoleVariables.ini
    Init: Version: 10897
    Init: Epic Internal: 0
    Init: Compiled (32-bit): Feb 13 2013 11:16:29
    Init: Changelist: 1532151
    Init: Command line: editor
    Init: Base directory: J:\UDK\UDK-2013-02_nvidia\Binaries\Win32\
    [0001.45] Init: Computer: ENZO-PC
    [0001.45] Init: User: Enzo
    [0001.45] Init: CPU Page size=4096, Processors=8
    [0001.45] Init: High frequency timer resolution =3.517841 MHz
    [0001.45] Init: Memory total: Physical=15.9GB (16GB approx) Pagefile=31.9GB Virtual=4.0GB
    [0001.46] Log: Steam Client API Disabled!
    [0001.57] Init: WinSock: I am Enzo-PC (
    [0001.57] Init: Presizing for 0 objects not considered by GC, pre-allocating 0 bytes.
    [0001.60] Init: Object subsystem initialized
    [0001.61] Log: Last hardware survey: Ver=-1, Date=0. Uploading again.
    [0002.92] Log: SystemSettings based on: SystemSettings
    [0003.01] Log: Found D3D11 adapter 0: AMD Radeon HD 7900 Series
    [0003.01] Log: Adapter has 3039MB of dedicated video memory, 0MB of dedicated system memory, and 3811MB of shared system memory
    [0003.03] Log: Shader platform (RHI): PC-D3D-SM3
    [0003.64] Log: PhysX GPU Support: DISABLED
    [0003.79] Init: Initializing FaceFX...
    [0003.82] Init: FaceFX 1.7.4 initialized.
    [0009.07] Log: Successfully upload UDK hardware survey to in 3.26 seconds.
    [0009.07] Exit: Preparing to exit.
    [0009.14] Exit: Object subsystem successfully closed.
    [0009.19] Log: Shutting down FaceFX...
    [0009.22] Log: FaceFX shutdown.
    [0009.24] Exit: Exiting.
    [0009.24] Log: Log file closed, 05/07/13 19:06:24
    but if i try with a clean install and copy all the files into the new installation it will work.

    any ideas why is this happening ? i have some projects that i have made with the beta of september 2010, don't know if i have the original setup file for that.

    thanks in advance for all the help.

    after a lot of research, the problem was caused because my card was overcloked by default by the catalyst drivers, when i turn off the overclock feacture all my old project has worked fine.