Not to discount anything Greg says...but you might check your pc and see what type of pre-installed card reader is in the pc....

If it's an older pc...it probably has the "older" SD card reader...which is a different format than the SDHC card reader....

A SD card reader will not read a SDHC card...

If you want to use the "older" pre-installed SD card reader...you should purchase the Sandisk Extreme III 2 GB card...the largest Sandisk makes in the SD format....

If you want to use the bigger SDHC cards and your pc will not read them...then you will have to , also, purchase a SDHC card reader...about $20...