I've been looking on the internet and I couldn't really find a list (other then really outdated lists) so here it goes, what software is a must have for your PC gaming system? 1) FRAPS 2) Precision X Two I had never heard of until I was searching around just now: 1) CCleaner 2) Daemon tool
None of those softwares are ''must have''. Fraps is for game recording, CCleaner is for cleaning and optimizing your PC and Daemon tool is for mounting virtual discs. The closest one to must have is CCleaner. You should get that, I recommend it.
I quite agree with you@matrxor. The only one you really need is the CCleaner, to optimize your PC for the game. To me the most important thing is to get a PC with a good processing speed and generally good Specs. That's the most important thing to me. This is because some of these things are even defaults and actually don't affect the PC in any significant way.