My computer can't read 8GB micro SDHC card

My computer reads the 512 micro SD card fine.
My adaptar came with the 8GB Micro SDHC card, so I know it should work.
I have downloaded the drivers, but it said I already had them.Help?

It needs to be a MicroSDHC reader.

What do you mean? It is a Micro SDHC reader, or so I think.... it came with the Micro SDHC card

it may be considering it to be a hard disk and thus is not assigning it a drive letter.Right click on 'my computer' and choose 'manage'. In the left pane of the window that comes up, select 'disk management'. After a while, two horizontal panes should appear, the top one showing a list of all the hard disks in the computer. There should be one that is slightly less than 8GB in the list. Look at the name/letter in the leftmost column, it is probably blank. If so, select it and right-click 'change/assign drive letter and paths'. A blank box will come up, click 'Add' and choose a letter from the drop-down box. Click OK on all boxes until you are back to Computer Management, which after a few seconds should refresh to show the new drive letter. You can format the microSD by right clicking on its entry in the list if you wish, and it will now appear in my computer.

Thank you for your aid and advice, but that didn't seem to be the problem. I'm starting to think the printer that I'm plugging it into may be at fault because now nothing is getting read. unless... There is one problem I haven't tried that I will now.^.^EDIT: Nope... The computer is a duel computer hooked up to one monitor... I tried switching the computers and found that I was on the right one.

you need to connect it directly to your computer.

PROBLEM RESOLVED: The Micro SD card to SD card adaptor was plugged into a printer which was not SDHC compatiable. The USB adapter was not SDHC compatiable. I went to the store and bought a good adaptor for 20 bucks and now it works fine.

Like I said, you needed a MicroSDHC reader. :)