after I installed the 1.9, dx11 and high res texture pack when i play the game the position is incorrect, its like where the computer thinks the mouse is is actually up and left from its position? also the game starts in 1280x720 every time. can anybody help please?????

d957bx2 motherboard
q6600 CPU
ocz 240gb ssd
ati hd5870 graphics
8gb ram