Welcome to TSG, Tazpaige.
When you were on Dell's website, did you install the Media Card Reader driver?
Click Here to go to their site, click the "down arrow" on the cd/dvd tab, Then download the driver (note: it lists a few downloads. You want the driver, not the application or firmware).
I wouldn't download a driver from any other source because of the possibility of viruses. If you are truely missing a chipset driver, then download and install their intel driver (I would suggest doing this before you install the media card driver).