Visit the graphics card manufacturer's website, download an updated driver and install it.
Which browser are you using? If Internet Explorer 8, have you tried the compatibility view for the site your visiting? (If the browser is updated for compatibility view sites, click on the little broken piece of paper in the upper right section of IE.
Hope this helps.
I just started using my Vista laptop, after a month or so the screen started jumping up and down. I started downloading something and canceled it then this problem came up. It does not do it in all programs only on the internet. Thank you in advance for any help.