With a Core2Duo and a GTX460, there are no other options aside from Minergate that stomachgrowls suggested or the one I will recommend you.
But I highly doubt that mining service's...~ service, beside the fact that you'll probably earn cents per day, most of your mining income will just go to the site and your "
referree".
But you got no choice, most mining software won't even mine using that GPU.
Or Try to mine Cryptonight coins using this:
[CPU][XMR] Monero CPU MinerThe author claimed that it's optimized for SSE4 processors like Core2Duo/Quad with 50% more hashrate.
The code was clean based from the last review but there have been a lot updates happened since then. (
I can't vouch for the security).