Well you open the NVIDIA control panel by right-clicking on the desktop, and select the NVIDIA control panel, and in the middlish of the screen you'll see the General Settings Tab, and a Program Settings Tab. Click on the Program Settings tab and you'll see a list of programs that it supports. More than likely SF2 isn't supported, so you click on "Add" and select the SF2 Game executable (whichever one you need to use) and then go to 2. Select the preferred graphic processpr for this program." Select the drop down Menu the NVIDIA card. Then you can use the card as it defaults on the integrated driver (Don't use this). Apply at the bottom right and then try it again. As far as Windows Defender you got me, as I use AVG for my antivirus, and don't touch that at all.