Where can i find the windows 8 pcixx12 card reader driver for my laptop?

Try card reader in another laptop to make sure its working.
or
insert card reader right click on my computer = Manage = Device manager find yellow question mark driver uninstall it and scan again you will find scan icon upside
check the card reader driver for you windows 8.

Unitech's website is the first place to start. There may not be a windows 8 driver yet.

Download the driver for the sd card reader

Sometimes , when a Computer's OS is upgraded, form the original OS, you will find "Unknown Devices" in Device Manager. "Coprocessor" is common. Usually it's the Card Reader, try installing the driver for the Card Reader, Windows 7 32 or 64bit what ever OS Windows 8 is. You can find the drivers here, choose your OS 32 or 64bit, try Driver-Storage, Realtek USB 2.0 Card Reader, you must change compatibility of the Win 7 driver: Card Reader driver: http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?cc=us&lc=en&dlc=en&product=3927357 Change driver compatibility: http://www.eightforums.com/tutorials/6832-compatibility-mode-use-windows-8-a.html

The drivers for the Card Reader should be in? Open Device Manager and check Card Reader. Did the Laptop come with Windows 8 or did you do a OS upgrade? Try Toshiba Support : http://www.toshiba.eu/innovation/generic/SUPPORT_PORTAL/

It's a common problem when you do a OS upgrade, Is that the only device in Device Manager that isn't working? Any Unknown Devices? You didn't supply the Model of Toshiba, or the original OS? Download and save the Card Reader driver for Win 7, Change the Compatibility of the driver and install.

It's a common problem in a OS upgrade. Is your OS 32 or 64bit? Is that the only thing that out of service? In Device Manager do you show ANY Unknown Devices? Is the Card Reader Listed? post results.

You may be exceeding the Hardware limits of your laptop, Win 8 has hardware minimum requirements. See: http://windows.microsoft.com/en-US/windows-8/system-requirements That's a common problem in a OS upgrade. Did you check the Hardware Compatibility list before you installed Win 8? Take a look at this: http://pcsupport.about.com/od/termshm/g/windowshcl.htm First you must ID the Unknown Device, Card Reader is common along with Fax modem, Audio, on a full size laptop. ID the device and download the driver from the Dell website.

Check the manufacturers website under the part number. There will be a driver available for download, if one is required.

Did you install from the Gateway-modified version of the Microsoft Windows CD-ROM, or from a "generic" Microsoft Windows XP disk?

If the latter, then your computer is missing the "device-drivers" for some of the Gateway hardware, namely the wireless adapter, and the M.S.C.

So, access Gateway's web-site, enter your model-name and model-number, and look for "downloads" for Windows (XP? Vista?) for your computer.
Download and install the selected device-drivers, to add support for those devices.