Just wanna get out some information about logitech mice.First of all you should goto www.logitech.com to get your mice's latest drivers.Also the drivers for some mice(like mine,wheelman optical)dont work(I stress the mouse actually works but it uses the old drivers) if you plug the mouse into a USB port if you are using windows XP.I notice my mouse speed freaking out on me sometimes.To fix this i plugged it into the ps/2 mouse port and it worked much better.
Also there is a problem with the middle mouse button and scroll freaking out in CS.I fixed that by selecting start - run - Run msconfig .Then in msconfig goto the startup tab and uncheck the
EM_EXEC
and
Logi_MwX
hit apply....then OK
Restart
Dont forget to click the startup message not to tell you evertime.This way it stops loading the software for the mouse but still uses the drivers.Making the scroll and middle mouse work properly.