Accidentally ejected Windows driver

In trying to eject a flash drive, I accidentally ejected the windows driver in the Finder window on the MAC side. I restarted the computer and the driver returned but now when I try to switch to windows side (using boot camp) a window says that it can't open be cause <windowsroot>\system32\hal.dll. is corrupt or missing.
Is there a way to fix this without erasing windows and re install with bootcamp? I don't want to loose the files on the windows side.
Thanks,
leinpr

i had to do a system restore, but now the driver is working

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