You will need to remove the current dll'd from your system 32 folder or rename them before replacing with the new dll.
Im not sure here but scannow replaces broken or corrupt system dll files,so maybe its worth running this first.
Start / run and type
If this just flashes across your screen,run scannow from a command prompt.
Start / run and type cmd and enter.
Then type sfc /scannow and enter.
Note the space between c and /