This works for some business PCs that are used for specific purposes, such as controlling machine tools, but isn't practical for most users. We show you how you can carry on running Windows XP, if you must. Qualys also offers a browser-checking site. The solution is to use a "limited" account, which also limits what most malware programs can do. Using an unsupported operating system is risky, but don't despair! That's more than million machines.