No you do not need that.
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A computer should be able to be plug in supported and have the latest version of flash in order to play games. Therefore the newest personal computers would be best for playing online games.
In order to do that , you need to use bluestacks as your android emulator. This will allow you to play the game on your PC. Visit the related link for tutorial.
Nope - Malware can get onto your PC from a variety of sources. You just need to stay away from sites that you don't implicitly trust.
To use a wireless microphone you need the software to upload to your pc and a wifi connection with blue tooth capabilities between the pc receiver and the microphone itself.
If the peripheral component draws power from the PC then that could relate to a problem on the PC. If it draws power from the same extension and the things in that extension are drawing too much power for the extension then that could also affect the PC.