SSD for is but HDD for applications

The AV program you have to install on your SSD system.

Not sure what you did with bigmck's link. But you cannot just move or link programs that are already installed. You have to reinstall those games and during the installation you have to point them to a predefined folder on your HDD. Just call this folder Games Library and define it in any partition on the HDD before you make the first games installation.

I recommend to install as many programs as possible on the SSD (better performance). But leave appr. 15% of the SSD free at all times (for garbage collection). On the HDD I would install those games that are not performance critical. Normal programs are usually small and should be on the SSD. And ALL system files should remain on the SSD too.

On the SSD you can gain some space if you get rid of the hiberfile (provided you do not use hibernation). The command is:

powercfg -h off

You can also reduce the pagefile to 2 GBs if you have 4GB or more RAM. With e.g. a system that has 8GBs of RAM, those two operations save you 14GBs on the SSD.

You can install anything you want on your hard drive, just change the drive letter in the path to the letter of the hard drive

For example your ssd is C your hard drive is D, so just change C to D when you install programs, games or what not.

As everyone has stated, keep the programs on the ssd, put games, documents, pictures, movies, etc on the hard drive.

Your gonna have to re install your games.