Figuring out the cause of a problem is often the hardest part of troubleshooting, but by itself it doesn’t do you much good. Once you know the source, you need to parlay that information into a fix for the problem. We discussed a few solutions in the previous section, but here are a few other general fixes you need to keep in mind.
Close all programs. You can often fix flaky behavior by shutting down all your open programs and starting again. This is a particularly useful fix for problems caused by low memory or low system resources.
Log off Windows XP. Logging off clears the RAM and so gives you a slightly cleaner slate than merely closing all your programs.
Reboot the computer. If problems exist with some system files ...