Since the only thing you did was update Windows and your graphics card driver, that certainly helps to narrow it down.
You could first try rolling back to your previous graphics card driver settings via your Device Manager.... right click "My Computer", select "Properties", click the "Hardware" tab, select "Device Manager", select your listed graphics card in "Display Adapters", then right click to select "Properties", and click the "Driver" tab. You should see an option there that allows you to roll back to your previous driver.
If that doesn't help, then at least you know that you've now narrowed the culprit down to just the Windows Update as your problem.
Another possible solution would be to try doing an overall "system restore" to its last known configuration prior to installing any of those Windows updates / graphics driver.
I hope someone else can chime in with any other possible ideas. I know how annoying and frustrating a jerky web browser can be, that's for sure! Good luck! :)
~ Sarah C.
1.9ghz Athlon XP 2600+
80gb HDD Primary
40gb HDD Secondary
Windows XP Pro w/ SP2
512mb DDR PC2700