It seams mining working only under linux at the moment.
it's seems there are many miner, cuz' i found a block very rare.... and my window walltet is sycronize corectly

later this day, i wil try to build and compile simplewallet for windows x64
I tried compilate again in ubuntu installed from scratch again, at 77% now, seems better but still got some warnings about breaking strict rules:/
can you post here log event, what happen, maybe it's posible to help you, but first leave it to run to 100%