Well there are 3 things to do : 1) Increase the USB polling interval to 250hz instead of 125hz, there is an article on <<spam>> : http://www.<<spam>>.net/forum/...hp/t233517.html One remark : they switched the 500hz hex code for the 250hz hex code, so if u want 250hz, change the line to the one that says 500hz in the article 2) Disable enhance pointer precision in windows, this will disable the acceleration in windows , but not in games (see 3) 3) Disable mouse acceleration in games by changing the next registry entries HKEY_CURRENT_USER\Control Panel\Mouse SmoothMouseXCurve: 00,00,00,00,00,00,00,00 00,a0,00,00,00,00,00,00 00,40,01,00,00,00,00,00 00,80,02,00,00,00,00,00 00,00,05,00,00,00,00,00 SmoothMouseYCurve: 00,00,00,00,00,00,00,00 66,a6,02,00,00,00,00,00 cd,4c,05,00,00,00,00,00 a0,99,0a,00,00,00,00,00 38,33,15,00,00,00,00,00 GL !