Microsoft Smart Card Base Components
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DO NOT INSTALL SCBASE.EXE AND SMCLIB.EXE YOURSELF, YOU MAY
CORRUPT YOUR SYSTEM.  RdrInstall.exe (or RdrSetup.exe) will
install the components as required.

If you have installed the Base Components under Windows 2000
despite this warning, here is the solution:

You can recover the smart card subsystem with the following
commands on an administrator's console window:

  Regsvr32 %windir%\system32\scardssp.dll
  Scardsvr reinstall

Reboot and the double-click the REG file to set the smart
card service back to automatic start-up.