I'd say that the USB connection in an UNLIKELY source of the blue screen but having worked on computers for several years I couldn't say it's impossible. I've seen some weird problems as far as troubleshooting computers. Also, blue screens, for the most part in my experience, are usually indicative of a more serious problem than just conflicting programs. Blue screens usually indicate a bad sector on the hard drive or some kind of malware damage to the hard drive. The operating system tries to boot, hits the bad sector, and throws a blue screen error which is akin to the computer screaming "WTF WAS THAT?" I've been able to repair blue screen errors by using programs like G-parted which is more of a troubleshooting software that is not very user friendly and outright dangerous to use if you don't know what you're looking at because you can very easily blank your hard drive. If it keeps happening, it might be worth a trip to your nearest IT repair store that you trust. Otherwise, I'd start backing up my info off that computer onto an external hard drive or something. Blue screen errors can quickly develop into "my computer is dead" type errors with little or no warning. Not trying to jinx you, just telling you what I've seen from my days of IT troubleshooting.