16GB Micro SDHC not detected by both Samsung Galaxy and Windows 7(With card reader)

Sandisk 16GB Micro SDHC not detected by both Samsung Galaxy S2 duos and Windows 7(With card reader).

It appears as a drive with 0 memory,when i double-click says “enter a valid drive…”

I just bought this 2 days back from a branded store!

You could always take it back and try a different one (while you’re in the store).