Hi all, long time no visit

as things have been running smoothly.....Until now. My present set up has 2 IDE hard drives with windows 7 on each (just in case I get problems with one installation) I have just bought a 500GB SATA drive and installed this alongside the previous drives.so far so good...the Bios recognises this as a valid Drive but when I boot up and go to my computer this isn't showing up?

Not sure where I am going wrong..tried to put Windows 7 on this (Just to see if this recognises the Drive) but It cant install as it needs formatting first....any Ideas would be more than appreciated....thanks in advance Pete