When I plug my phone into Dell laptop to update or sync computer shuts down

I'm trying to sync my iPhone with my outlook contacts or photos and plug my iphone into my DELL computer.It first recognizes the hardware and then computer screen goes blank saying that "beginning to dump physical memory" and "computer was shut down to prevent further damage". It happened to me when I just purchased a defective iphone. Once they replaced it with the new one, the problem was resolved. A couple of months later the same problem started again.
Is there anything anyone can suggest to do? I really want to keep my iphone up to date and sync with my outlook contacts and calendar...

I have exactly the same thing with my new iPhone when syncing to my Dell XPS; now on my second phone handset too. The same message comes up in a blue Dos screen.
Can we have some serious replies please! this is a £2500 laptop, not a toy!

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