There are lots of inquiries that Windows7 users can't log in to the systems with their IC card authentication． It seems to be due to Windows version update．

For the solutions, there are information from the Microsoft Inc． There is the case that rebooting PC help your solution however please try 回避策１in the following website in case it doesn't work.．

The issue that IC card reader doesn't work after updating the program https://blogs.technet.microsoft.com/jpntsblog/2018/02/19/card_reader_problem_after_update/