Wow, she's already losing her looks.
Why they show her talking to Dolphins is pretty simple. Computers are commodities. There's really no differentiation done at the OEM level, and instead they have to sell the sizzle instead of the steak. You try to make a commercial to hold interest, show it as a tool (even though a different computer could have done it, this is irrelevant), and people associate this sub-consciously with a tool that can be used to do exciting things.
You have to remember, people using computers now are in many cases morons. It's not the 1970s, 1980s, or even early 1990s when computers were owned by only a segment of the society. So, you get Coke/Beer/Corn Chips type advertising. They don't tell you why their computer is better, no one would understand it anyway. They sell the sizzle. They do understand that.
It's sad, really, but not as sad as the fact women lose their looks so quickly. She seems to have set a record. Yuck.