I saw a reply here that said the Logitech drivers don't coexist with the iPhone. DAMN RIGHT!
My computer crashed and crashed and crashed. Then it would suddenly cooperate. When the iPhone update software tried to install recently, it crashed everything, computer and iPhone. I had to restore. Restore only partially completed and I had only my contacts and schedule, none of my iTunes stuff.
Then, the blue screen was back with a vengance. No cooperation, EVER!
I uninstalled the Logitech drivers for the camera and video... All is well. Never used them anyway.