That's a lot of software to install just to game. And one wonders why so many would rather game on consoles.
For me, the bare minimum to getting good gaming experience is to ensure my drivers (particularly for GPU) and Windows (Service Packs & DirectX) are up-to-date. Some games seem to demand that PhysX is installed so I have that installed as well.
Daemon Tool is useful if you game from ISO files, rather than optical discs, but otherwise not necessary. AV programs are crucial for system security but otherwise does not directly improve gaming performance. A lot of the others mentioned are monitoring tools, but if you don't care about that, not having them installed won't kill your gaming experience either. I will mention Speedfan as I use it to manually fine-tune my case fan speed (high speed during gaming & really low speed otherwise). Again, not necessary if you don't care about controlling your fan speeds and monitoring temperature.