Oooh, strange.

I would suggest that your PC is making repeated connects to the Google page, though for why I have no idea.
I guess this could be an attempt to attack Google, in which case it suggests you do have something on your PC that might be joining a crusade against them.

In all honesty, if that's all it's doing, I'd be tempted to let it run! lol

I've received that a dozen times after running SEO software. If that's something you're doing, you'll likely get stopped from doing searches for 30 min-1 hour or more.

Your computer has malware on it. get that removed and the error 403 messages will vanish into thin air.