When you use a 16-bit PCMCIA card on a Windows Vista-based computer, the card may not be installed correctly. Or, the card may not otherwise function correctly. When this issue occurs, a yellow circle and exclamation point may be displayed next to the device in Device Manager (Devmgmt.msc). Additionally, a status message that resembles the following may be displayed on the General tab of the device properties:

This device cannot find enough free resources that it can use. (Code 12)
If you want to use this device, you will need to disable one of the other devices on this system.
The device instance does not exist in the hardware tree.