@rbaker : I don't think that's likely to help - of all the components involved in this problem, Win32DiskImager is probably the one that can be most relied on.
@BigBoss : Does Win32DiskImager report that it has successfully written to the card?
If so, are you then able to see two new drives in Explorer (maybe E: and F:)?
If so, you should be able to access one of them, but not the other.
A Yes to all of the above would suggest that the SD card is probably ok, although it would still be useful if you had a second card that you could test with.
If you put the SD card in the Pi and switch it on, do you only see the red LED lighting? Does the green LED light at all?
If you're not seeing the green LED, that suggests that the Pi is not even trying to read from the card, and you would need to check things like whether your power supply is delivering enough current.