I'm on Windows 7, and my version of VC is the latest one from Steam. Chrck your mouse sensitivity from windows settings. That's got nothing to do with it. The vertical sensitivity (y-axis) is completely out of sync with horizontal (x), and the in-game setting only affects the horizontal sensitivity - it doesn't even touch the vertical one. The R3 button also activates the sirens and lights on emergency vehicles, police, firetruck, and ambulence, as well as all the FBI vehicles. Double tap the horn to turn them on and again to turn Well, I have a laptop. It has the following installed. Laptop - Dell Inspiron 1000. BIOS Vendor - Dell Computer Corp. BIOS Version - A01 (Q3B00) R6OcHm.