I've had a SmartNav 4 installed on my Win7(64) pc for about 4 months now and it has no problems.
About a week ago, I suddenly experienced choppy performance in games. The desktop was fine, game menus were fine, but in the gameplay it was a slideshow. The slightest movement would turn me about 60 degrees.
I just used Windows 7 to restore the system to a bit over a week ago (before I installed some dodgy webcam software). Now SmartNav won't even detect the camera!
If I start the software, I get the "Could not connect with a SmartNav Camera! Mouse control will be disabled until a SmartNAV camera is plugged in." message.
If I unplug the camera and plug it back in, Win7 tells me it can't find drivers for it. Different USB ports gives the same result.
I just uninstalled the SmartNav software and downloaded the new release. Installing it gives the same result

Save me Vincent! You're my only hope!