Easiest way...
Next time you type in something that is automatically formatted as a
hyperlink, point to the hyperlink and you will see a teeny rectangle under
the beginning of th hyperlink. Point to it and an AutoCorrect Options button
will appear. Click that button and then click Stop Automatically Creating
Hyperlinks.
Or - Office Button, Excel Options, Proofing, AutoCorrect Options, AutoFormat
as You Type, and remove check mark from Internet and network paths with
hyperlinks.