Windows 7 only 125 hz on my mouse

Hello , i have only 125 hz on my usbports (Mouse) in Windows 7. In Windows xp i dowloaded i file that i putted in system32 to get 500 hz , i tried to put that same file in system 32 in Windows 7 but then my mouse didnt work so i had to replace the old file back. Please help me, i cant play Counter strike with just 125 hz.

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Anyone ???

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