Thanks for the help.  I did not build these machines and I can't even tell who made the board or its specs.  The slot is labeled, "PCIE16X". 

These are new, inexpensive machines from staples. 

It is my company, my machines, my electric bill so we are legit there.  I know at current levels this may not be profitable but I believe bitcoins will rise in value soon.  Also, it give me a tax benefit on the business side and lets me move value out of the company so I would like to do it if I can. 

All machines are running window 7 and I've installed Diablo Miner on the machines already.  They mine fine off the CPU of course it is ridiculously low hash rates.