Warzone configuration is usually not very important. For hardware information it is mostly important if you have a 64bit CPU and operating system (eg. WinXP64) or whether you have a nVidia or ATI graphics card.
Especially for the graphics card common sense should be used. If you report a problem that doesn't have anything to do with graphics (eg. WZ cant find a file, or the sound is crappy, etc.) you don't need to give that information. The CPU is a bit more tricky, because if you compiled Warzone yourself for a 64bit system you might discover bugs which wont show up otherwise.
Generally: If some particular info is missing (or if we suspect a specific component to be a problem), we will ask for it. Though this shouldn't encourage you to tell us "There is a bug in the multiplayer mode". A little bit more info than that is needed of course.
The most important part is the _detailed_ description (I never saw anything which I considered too much!) of the bug and how to reproduce it. And of course the operating system and the version of Warzone you used...
A good bug description tells us what you did before the bug happened, what should have happened and what happened instead.
Information how to make that bug show up may be as interesting as a description under what circumstances the bug does _not_ appear. (Common sense applies. If you have a bug that nearly always happens, this is useful. If you report a bug which nearly never happens or only under very specific circumstances, then the negative testcase wont help us at all.)
Savegames are also very useful.
If you know how to use a debugger and have one at hand: A backtrace is allways more than useful.