Thank you for answering my questions and verifying that I wasn't mining.
What solo miner software do you recommend if I have 7-8 separate PC's, most of which are in one room and several others are a few miles away? Cooling and electricity will not be a concern.
I realize that I won't make much, but why not give it a go since I have the computers and have no other costs?
cgminer is a good mining software. Set it up on each device/computer and point it towards a pool or a computer running your bitcoin client service with RPC active. However, don't solo mine unless you have 50-100 GH/s minimum, which is the equivalent of about 100 HD7970 ... Use a pool software instead, e.g. p2pool.