Sandisk sdhc problem on D7000?

Hi, i have the nikon d7000 and i've tried 4 sdhc cards ( 3 different Sandisk Extreme 30mb/s class 10 ) and 1 (sandisk class 4 ) but the problem is that after i take pics with my d7000 i can see the pics in the camera with no problem, but if i try inserting the sd card in my pc card reader it won't be recognize by windows 7 or xp, however if i connect the camera to the pc via usb i'm able to view all the pics in the sd card, i wonder if there's something wrong with my camera or do i need special driver for sdhc cards?

Well it seems to me that your card reader does not support class 10 sdhc.
just try to get a new card read and check if it works.never seen such problem with my sdhc card.

Your PC does not support SDHC 3.0 cards includes all class upto 10.
you need USB card reader that you can plug usb to your PC and insert your SDHC card to your PC.
after you doing this you can see all picture files in your PC. You can buy cheap card reader from ebay that cost under $4. Check this link.http://cgi.ebay.com/23-in-1-USB-2-0-Memory-Card-Reader-SD-SDHC-MS-CF-MMC-XD-/270714812830?pt=PCC_Drives_Storage_Internal&hash=item3f07dc399e

Hope, this answer helps you.
Good day.