Mouse lag.

Hallo since 2 days i started playing crossfire again and i have been expiriencin mouse lag when i start the game.

When i start the game and HGW is loading i can move my mouse normally when the HGW loading is finishes my mouse start lagging its like moving 2 frames per sec this doesnt happen in any other games and i also never had it before. Even when i login its still laging and also when i get into a room.

I have a logitech G400 mouse
And my OS is windows vista

Can someone tell me how i can fix this anoying mouse lag?