ditto on what nub said, I installed win98 on a very old computer recently, only to have it freek out at every time I tried to install a driver. Reinstalled it a 2nd time, and it stoped, its still kinda acts retarded, but I chalk that up to being a socket7 running win98.
uhhh well theres about 4 or 5 ways to do that first one.... If you have a desktop shortcut to run 3dmark then right click it, goto propertys, on the shortcut tab... where it says target add ' -nosysteminfo' on the end.... with that space, so it should be like "????.exe -nosysteminfo"...
That second fix click the start button, goto run, type in 'services.msc'. Now a window will pop up with all the crap thats running, look for 'Windows Management Instrumentation' see is its running, try to start if it isn't, or if its even there.