What's with Comcast and new site(s)?

Anybody know? I'm in middle of creating a LAN at home with my desktop and new HP laptop so I lean on the desktop to access Internet. I have never gone so slow as I now do on Comcast anything, and I supposedly have the fastest speed (digital cable). When I get this all set up I'll use my laptop to get mail into Outlook. But right now I'm very puzzled why everything moves like a Slowsky! It was NOT that way a little while ago when this machine was loaded with a lot of stuff.
And I see complaints all over Google. What gives? This machine is very clean. I just formatted it and reinstalled Windows 2000 with I.E. 6.0. No bugs, no anything to slow it with so little on it yet (I won't be using it except as needed for wireless router unless it's some special thing it runs that I cannot install on the HP on Vista and I.E. 8 (soon to be Windows 7).
Thanks much.