Smart Card Service
Path to Smart Card Service: %windir%\system32\SCardSvr.dll
Manages the access to smart cards on the computer. If the service is stopped, the computers won't be able to work with smart cards. If the service is Disabled, all the services that depend on it won't start.
In case that the Smart Card Service on your computer is working correctly or missing you can use Fix PC/SC from SCM Mycrosystems to make it work. Start the program that is in the archive, click Begin and follow the instructions.