Unable to Detect SDHC Card on Windows 7

Question

Hi guys, recently I received a 4 gb sdhc card but when insert the card into the card reader & plug to the usb port, win 7 was unable to detect it. 1st thought was this sdhc card is bad but i when plug it to another win 7 pc it detects
straight away, so the card is not faulty. I tried uninstalling the usb driver & HID driver still can't detect. Notice that under the disk drives it does show 'Mass Storage Device USB Device' which means it actually did detect but won't show up
in 'My Computer' ..... Why? Hope someone can help to resolve this issue. Thanks

Answer 1

Here is the answer from Scandisk
STEP 1 - Backup the registry
1. Unplug the device from the USB port.
2. Run regedit.
Windows XP: Go to Start > Run, type in regedit and then click OK.
Windows 7, 8 and Vista: Click the Start button, type regedit in the search box, and then press Enter.
3. From the registry menu, choose File > Export.
4. Name the file SNDK.reg and save it to your desktop.
STEP 2 - Remove SanDisk info from the registry
WARNING: DO NOT delete any registry key other than keys that include VID_0781. Deleting registry keys other than keys that include VID_0781 MAY cause your computer to not boot properly.
1. From the registry menu, click Edit and choose Find.
2. Type in VID_0781 and click Find Next.
3. Once the search finishes, right-click the highlighted registry key and select delete.
4. Press the F3 key to find the next registry key that includes VID_0781.
5. Right-click the highlighted registry key and select delete.
6. Repeat this process until the search returns with No results Found.
NOTE: Under Windows 7, 8 and Vista, some registry keys may be protected and cannot be deleted. Simply skip over these keys if you receive a message that the key cannot be deleted.
7. Once all registry keys containing VID_0781 have been deleted, reboot your computer.
8. Plug the device into the computer after it's finished rebooting.