After I had this problem : http://www.esreality.com/?a=post&id=1857216, I bought myself a new pc. I thought everything will be fine, my Abyssus will have 450 dpi now. BUT NO, even on my new pc, the dpi STILL is ca. 800 dpi. I mean, wtf could have happened. The mouse itself has been infected, my router perhaps ?
Help would be so much appreciated.