Inserting an SDHC card into an incompatible memory card reader might cause the card to stop responding or lock up the computer window. To immediately fix the lock up, double-click the Safely Remove Hardware icon (in the notification area in the lower right corner of the screen), select the USB card reader, and then click Eject. The card reader may not work until the computer is restarted. You can now safely remove the memory card and use the computer for other activities.
To use your higher-capacity memory card without locking up the computer, do one of the following:
If you are using the card in a camera or other device, attach the device to the computer using a USB or FireWire cable. When connected, most devices appear in Windows as a Removable Disk and can be used in the same way as the card reader.
Buy a USB memory card reading device that plugs into an open USB port. Make sure the USB device can read SDHC cards. These devices are inexpensive and can be used in any computer that has a USB port.
Figure : SDHC to USB card reader adapter