I bought this tablet without a SIM card. I have a WiFi connection, but it still doesn't let me download from the Android Market.
How do I fix this?
By your reference, you are using android market, not Google play store. This then, suggest that you need to update the store, otherwise you are not downloading anything. The store has been as Google play store for a bit over a yes now, so anyone using android market are severely outdated. You may have to download the apk, and install it, force updating it.