My hard drive is nearly full, so I added an additional drive which I made active and non bootable. ....

Yes and no.
If you want to use the new harddrive to store your documents and stuff like that then you can just move the documents over and start using them.
(to move the special "My Documents" folder and optionally all the files in it, right-click on MY DOCUMENTS, select PROPERTIES, and then choose "MOVE" on the "TARGET" tab)
If, however, you want to move particular programs to your new drive then you need to uninstall them from their current location and then re-install them on the new drive (probably via the "Custom" install option when you run the SETUP)
Be warned that some programs will insist on installing certain files in your Windows folders on your boot drive, which you don't normally have control over.
Sometimes the best things to install on the new drive are games - a) they generally don't install stuff in Windows folders and b) a lot of the newer games take up a lot of harddisk space so this will be a quick-win way of getting some space back on your boot drive.

If you choose the path of reinstalling programs on the new drive, you might want to check out Laplink's new product "PC Mover" which can do the moves without having to individually reinstall all the programs

You can reinstall your progams if you want to free some space on the older disc or you used to save pictures / project from those programs in their oryginal, default folders which can makes disck C: run out of the space. If your disc C: is full of programs and files it is recomended to reinstall some programs on the new disc, because the Operating System works faster and more eficient when it has more space. If you feel System works fine, and the old disk is not full, you can start install new programs on the new disk.