Windows XP smart card service re-install procedure

0. prepare a Windows XP installation CD (or make sure you have the \i386 folder)
1. remove the smart card service
2. make sure it is removed 
3. re-install it




- run "sc delete scardsvr" to remove the service
- start the included BAT file to call the installation wizard
	- uncheck the smart card service to remove it
	  (it seems that "sc delete scardsvr" does not fully remove it)
	- start the wizard again, then check the smart card service, press Next
	

Normally a reboot is not required, but if you still can't use the reader after
manually starting the service, restart the machine (perhaps there were some 
unusual service dependencies?)