If you are using a Logitech mouse, I would guess you are using Logitech's MouseWare.
In which case, you need to bring up the mouse properties, select the "motion" tab and un-tick the check box that says "Disable acceleration in games".
Personally, for most games, I prefer mouse acceleration off. In fact, one thing I noticed with my Dragon Chaser game, mouse acceleration renders it virtually impossible to control. I've been looking for a way of activating/disabling mouse acceleration within a blitz program. I believe the functionality lies within user32.dll via an api call to SystemParametersInfoA. The parameter SPI_SETMOUSE seems to be the focus. But I haven't been able to actually work it out yet. DLL's ain't my strong point.
Still, un-ticking that checkbox should solve your problem.
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