I figured out my problem with the 4GB SD card I had bought. It wasn’t Dell’s fault that it didn’t work; I chatted with a representative and confirmed the slot is supposed to accept SDHC cards. It turned out to be a Microsoft XP problem, naturally. It fell under KB 934428, in which XP requires a hotfix to make it recognize cards 4GB or larger. Of course, the hotfix system takes forever to respond, you actually have to wait for a live person to respond, so I found the SDHC card hotfix online and that was that! Now my computer recognizes my 4GB SD card no problem. Yay!