win xp 2 users + a game problem

hi i got a problem

i create 2 user accounts on my xp

and i started a game and few porgrams on it

then i tryed to swich to the other user (start/log of/swich user)and it works

but there is a problem

the screen size is limit up to 800x600 and color are limit to like 4 and this not leting me chang it

the setings works fine when i am not runing the game on the other user

is there any way to fix this so i can run a game on one and swich to the other and run other games??

thx