Laptop not recognizing Canon AFTER installing Norton 360

I have had my Canon Powershot SD40 for two years without a single problem. Last night we renewed our Norton anti virus and now the laptop will not recognize the camera for me to upload my images!

Evening went like this (with much searing):
- upgraded from Norton Internet Security to Norton 360
- immediately noticed laptop not recognizing camera
- uninstalled items under camers window link
- reinstalled, still not working
- do system restore to just before we installed the new Norton
- everything stopped working at network level
- ran chkdsk
- yes to repair bad sectors, this worked
- ran system restore again bringing us to just after we installed Norton 360
- laptop still not connecting with camera

When the things are working and I connect my camera docking station with USB cable to laptop and turn it on I get a window and a clear ding dong sound. However now I get no window and a very strangled muted sounding ding dong!

Thanks a bunch