How to install a hard drive

Hi all,

I just installed a SSD w/ windows 7 and I scraped a hard drive from my old computer and removed partitions and it works perfectly because windows could see it when It asked where I wanted to download windows to.

The problem now is that I have a 500gb hard drive plugged in that I can see in my bios set up. But I cannot see it or save any information on it when I am in windows. Any one have any ideas? Really appreciate any help, thanks so much in advance!