In the new version [of Genuine Advantage], PC users found to have a pirated copy of Vista will continue to be able to use their computers, but with unmistakable signs their operating system is a fake. The desktop wallpaper will turn black, and a white notice will appear alerting users to the problem. Each time they log in, they will be prompted to buy legitimate software, and every hour, a reminder bubble will appear on the screen.
Users with a high tolerance for irritation can put off switching to genuine software indefinitely, but those who relent and buy a real copy of Windows can do so at reduced prices — $119 for Windows Vista Home Premium, half the regular retail price.
Microsoft Softens Piracy Response