I had a new laptop, XP Pro SP2, IE6. Graphics in IE and in the start menu and taskbar were blocky, pixelated.
The problem was, Dell knew the display was hi-res and small, so they set a registry setting for me to automatically dumb-down the graphics, to make them more legible.
This made web pages render incorrectly, and it made the screen icons look bad. Change this key to fix it.
Who says only Linux has silly things like this, or that Windows is more user-friendly? My grandma would never have found this fix.