computer not connecting, internet line fine

[PorscheNGuns]

So Im sitting here playing on Prima when all of a sudden my internet connection drops, no websites, no poker, no AIM, etc. I figure its comcast dropping me again, but my neighbor says his internet is fine.

My neighbor then brings over his laptop, plugs in my internet cable into his PC and he is on the internet fine. I then replug that same cable back into my computer and my "Local Area Connection has limited or no connectivity", or basically no connection at all. So it is localized on my computer, and I didnt change anything, like I said I was just sitting here playing poker and nothing else.

Ive tried turning my computer off for 5 min and then restarting, and ive tried disabling and then enabling the LAC in control panel.

So what the [censored] is up???

Thanks

-Matt