Have you ran the tweak test on the site? I see you're running xp so if the registery settings aren't right then crappy speeds are bound to happen.»/tweaksYou will need the app below as well to apply the tweaks.»/drtcp
I've run all the tweaks, rebooted the modem, rebooted the router and rebooted the computer.It's only Google.
Run a trace to google and share it with us and perhaps some signal levels too.
reply to Pathfinder as asked.