Windows has become unstable. The action center put up a flag that says "Firmware Linkage Driver has stopped working." My computer is a Toshiba C655-S5132. Upgraded to Win8 64 bit several months ago. Help!
So you will most likely need to access Toshiba's website, which is to some extent geographically specific based on your particular model number / serial number and see what you can find there after selecting downloads specific for Windows 8 64bit.
It may not be listed specifically as an actual driver but may come as a part of one of their proprietary software packages of applications and utilities.
You may need to download, install and use their Software Installer Program which I believe will check online for updates that your system may require.