When I solved the problem of frequently displayed fake Java update sites, I judged many programs as unnecessary and uninstalled them extensively through “Add or Remove Programs.”

After deleting several programs, the problem was solved, but some software stopped working and sound issues occurred. It seemed I had deleted necessary programs as well.

In such situations, you can easily restore everything to its original state using a feature called System Restore, so it’s good to remember this.

• What is System Restore - Windows Help

I hadn’t touched Windows for a long time, so I had completely forgotten about this feature, which caused me some trouble during recovery.

That’s all from the Gemba.