I don't have your Tablet PC, but if you have updated to Windows XP SP2 and
the Tablet PC Edition 2005, you might try reinstalling the SmartCard Reader
Driver and SmartCard Application.
The Acer support site lists both as the same as the original issue which
would be contained on your drivers CD which came with the unit. If that
doesn't fix the situation, I would contact Acer support.
Microsoft Windows MVP/Tablet PC
Tablet Creations - http://www.yqcomputer.com/
Expert Zone - www.microsoft.com/windowsxp/expertzone