When I went online today, I found that a dotted box appeared on every Flash that could be opened, and you had to "click to activate and use this control."

Thinking that I had fallen for it again, I tried everything and found nothing wrong. After thinking about it, it was only XP that automatically upgraded a patch today. Could it be his fault?

After checking it, it was true. It turned out that Microsoft released a non-security update for IE with the patch number KB912945 to avoid patent infringement disputes with Eolas and the University of California.

After installing this patch, IE's handling of ActiveX controls and Java programs will change. By default, it will not be actively activated. Therefore, users need to click one more mouse when accessing Internet content such as Flash advertisements, but non-interactive controls will not change.

If you see any dissatisfaction, you can select and delete it in the control panel.