what if im playing in a western quake map?

the sound can lag behind a bit on a slower computer, its only happened to me in flash animations where i check an im ingame... but never in Q3.

Whenever i try and type sv_cheats 1, or even set it on command line, it will say "sv_cheats" is read only.

so i check, and no matter what folder it is, every folder on cd appears as read only, but i can edit anything, but cant set it back... why is this?