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It says its not supported in Windows 7 anymore your best chance is to install the vista 32bit driver if your running Windows 7 32 bit or nuke it (new keyboard):
To install a driver OR program in compatibility mode - right click the setup.exe file - click properties - click compatibility - check run in compatibility with vista/xp etc - check run as administrator - leave the rest blank. Start setup.exe and install.
OS XP, Vista, W7 64bit Home Premium CPU Intel Core Duo 6850 3.0 ghz @ 3.7 ghz Motherboard Asus P5E Memory 4GB Corsair DDR 2 PC-6400 Graphics Card Ati 4870 1ghz Sound Card Supreme FX 11 Monitor(s) Displays View Sonic VX1962wm Screen Resolution 1680 X1050
Keyboard Microsoft Digital Media Pro Keyboard Mouse Microsoft Wheel Mouse Optical PSU Thermaltake 600 watt Case NZXT Alpha Cooling 3X120cm Fans Hard Drives 3 Seagate Sata Drives 160gb 250gb 500gb Internet Speed 1.5Mb to 8Mb/384k