I can't run the game?Make sure your PC meets the minimum specifications first. Be aware that downloading large collections of mods will have you sifting through the ones you don't like, or that don't work.
This is the same for just about every mod/update of 3DCG that there is. You'll have to look in various places to get them (there are mod catalogs available), but you should drop them into your 'arcs' folder.
I've had that happen on PCs where I had no idea that Nero was installed until I put in a blank, then it came up. If you have something like Nero installed, that might pop up asking you if you want to burn a disc as soon as you insert a blank one into the DVD drive. If you do have a DVD burner, chances are you also have at least one software program installed, maybe even one that came with your PC.