Micro SD card issue with phone?

First off, I have a DaneELEC 4GB micro SD card, and a brand new Samsung Rugby II. I can put pictures off of my computer on the card, and put the pictures on my phone, no problem. However, when I take pictures with my phone, put them on my card, and try to open the pictures on my computer (a 2009 Dell XPS M1730 btw), the card appears blank, with no photos or anything else. Can I fix this, or should I just buy a new micro SD card?