|2600W processor seems to be a lot of power.|
I suspect the OP meant 2600 Mhz ot 2.6 Ghz. My washing machine uses 2600W and that has a pretty powerful electric motor in in as well as a water water.
You can use the second hard drive just for data or indeed programmes. There is no need to install a second Operating System unless you really need a second operating system for some other reason.
If there is already an operating system on this second drive then I would delete it as it just taking up unnecessary space. It wouldn't work anyway if it was installed on another computer. Making it work would be more trouble than it's worth.
It is a fairly simple matter to install a second hard disk. However if you are not familiar with the inside of a computer I would get someone to do it for you.