What coin are you trying to mine solo? Is your coin wallet fully synced?
Have you set a coin.conf file in %appdata%/roaming/coin with the correct user and pass you're using on cpuminer?
I am trying to mine my own X11 coin which currently had 0 blocks. I have put a xxxx.conf file in %appdata% and set the ports and the server settings and I have two nodes running and the wallet connects to the nodes and appears ready. I am using cpuminer X11. I have turned off all the anti-virus stuff and turned off the firewall. I have also started the wallet with -conf=%appdata%/xxxxx/xxxxx.conf
I have Windows 7 pro, 64 bit
When I run netstat -a I can not see the wallet or anything listening on the port I have set and this is why cpuminer can not connect but why is the wallet not listening.