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21 Jun 2012  

Windows 7 Pro x64 SP1

Welcome 50Cent to the windows 7 forums.
You are trying to replace files that the OS has open and that's why it won't let you.

Microsoft when they update these kinds of files usually does it on a reboot after update so that before the OS loads those files, they can be replaced before they are loaded into memory.

I highly recommend that you have a good image backup of your system before screwing around with replacement of system files.

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