Has the iphone ruined my computer?

So i had a friend over, and he wanted to use my computer to transfer all his pictures on his iphone to his flash drive. I usually don't let people hook their iphones to my computer because itunes always pops up and kind of slows my computer down. But i went ahead and let him do it. Now, i didn't monitor his actions but as far as i know he just transferred the items onto his flash drive, but during the time his phone was hooked up, my computer fan started getting loud and my cpu usage spiked at 99/100% so i told him to disconnect his phone. Now it won't stop. I turned it off over night and right now is my first time being back on it. The usage spiked before i even opened anything and the fan is still loud. Does his iphone have anything to do with this? And more importantly, how do i get it to stop? I've had this computer for years and i know i need to get a new one soon probably but i don't have the funds right now.

Try uninstalling iTunes and reinstalling it. Your settings will be saved

if that doesn't work,
try booting to safe mode and debugging iTunes