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By default Windows XP applies an acceleration curve to the mouse,it means that every time when you move the mouse pointer,it starts out slowly and accelerates with continual movement.Do you want to increase the mouse speed in your pc?Then here is a two way for you to do:
FIRST STEP:
Click start---->all programs---->control panel----->mouse.click there POINTER OPTION tab and uncheck the ENHANCE POINTER PRECISION box below the mouse speed.This
does not completely remove the acceleration curve,it mostly does, allowing your mouse to reach much higher speeds in normal operation.
SECOND STEP:
Here you have to make some changes in registry to completely disable the acceleration curve of mouse in Windows XP in order to obtain better mouse performance.

(i)open up REGISTRY EDITOR by clicking start---->all programs---->type regedit in the search box and press enter key
(ii)Navigate to hkey_current_user--->control panel---->mouse.
(iii)On the right hand side find "smoothmouseXcurve" and change the value to:
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

(iv)On the right hand side now find "SmoothMouseYCurve" and change the value to:
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
now you are done.Enjoy with your new mouse movement speed!!!!!