Friend has trouble with new games graphics?

[WillNeedsHelpFast]

So, my friend recently bought ArmA: Armed Assault for the PC to play it with me. However, upon playing it he gets this extremely weird problem, and I honestly don't know how to fix it.

So, his screen looks like this when he starts it up:



He has the latest drivers. His PC specs are:

Microsoft Windows 7 Home Premium Edition (build 7600), 64-bit
ATI Radeon HD 4550

Pentium(R) Dual-Core CPU E5400 @ 2.70GHz 2.70GHz

Installed Memory RAM : 4.00 GB

We're honestly unsure of the problem.

[reddevilggg]

What are the required specs for the game??

[WillNeedsHelpFast]

    Minimum specification:

    CPU: 2.0 GHz Intel Pentium 4 or equivalent processor
    RAM: 512 MB
    Graphics card: Nvidia Geforce FX series or ATI Radeon 9500 series or higher (Pixel Shader 2.0)
    HD space: 3 GB (or more as needed for downloadable addons)
    Operating system: Windows XP or Windows 2000

    Recommended specification:

    CPU: 3.0 GHz Intel Pentium 4 or equivalent processor
    RAM: 1 GB
    Graphics card: Nvidia Geforce 6800 series or ATI Radeon X800 series or higher
    HD space: 4 GB (or more as needed for downloadable addons)
    Operating system: Windows XP

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What we're finding weird is that I have:

Windows 7 Home Premium SP 1, 64bit
AMD Athlon II x2 240 Processor @ 2.80 Ghz
3.00 Gig Ram
ATI Radeon HD 4200

And I don't have a problem?