MicroSoft Service Pack 4 and browser problems

I installed the MS service pack 4 which seems to have affected my browser in weird ways. At any rate, that's the only reason I could come up with for why I can get to my ISP's web site and MicroSoft's web site, but can't get to JavaRanch or Norton or MyPage.com or a few other URLs. (I'm not at home right now)

Has anyone else run into this?

The only time I have any issue resembling this, it turns out to be a routing problem with my ISPs backbone.
If you haven't tried this, do a tracert <website name> from a DOS prompt, and watch where it starts to go wacky. It may be at the ISPs router, the backbone, or at the hosting sites router.
If the packets appear to get there with no problem but you still aren't bringing up a webpage, then you know it is definitely something with the browser and not a network issue (which is what my gut instinct is telling me, but them I'm kinda hungry right now, too).

tracert seemed to work ok. Let me try uninstalling the Service Pack.

Your talking windows 2000? I downloaded and installed SP4 recently too. I'm having problems too... My cupu utilization went to 100%. The task manager shows services.exe and sysmangr32 are hogging cycles. Then I installed norton internet security. I found sysmangr32.exe ( could be spelled wrong ) was continually querying something on the internet. Norton blocks it and my cpu utilization is back down.
Norton says no virus found...

Interesting! And I was wondering what Norton Internet Security might be able to do for me. Sounds like it's worth a try.