SMCLIB.EXE is the update for the SCBASE.EXE. For the correct operation
of the USB PCSC driver, you need to have the most updated SMCLIB.EXE
installed.

Install the Smart Card Base Components in the following sequence

1. Install SCBASE.EXE (Do not restart at the end)
2. Install SMCLIB.EXE
3. Restart the machine

The Smart Card Base Components can be downloaded from 
http://www.microsoft.com/smartcard