Well, aside from getting a new card reader, the only other thing I could suggest is possibly putting a piece of tape on the SD card to hold the lock button toward the front of the card. Your card reader might have something tripping the sensor into thinking it's locked when it isn't.
If the camera can still write to it, then the card is probably ok. But you said the camera went on the blink.. so, it's not like you really need to delete the pics, if you don't have anything that will be writing to them..
<edit>.. wait, you're reading the trail camera straight into your PC to get the pics?