The reason why a dialog box always popped up when opening a web page in the Windows XP system was usually because the default browser security settings were too strict, causing some malicious websites to be unable to be accessed normally. To solve this problem, you can try the following methods: 1. Reduce the security of the browser: You can reduce the security of the browser by clicking the "Security" button in the upper right corner of the browser window and selecting the "custom level". This would reduce the risk of malicious attacks on the browser and reduce the chances of pop-up dialog boxes. 2 Close the browser window pop-up prompt: You can click the "Close" button in the browser window to close all open browser windows to reduce the chances of the browser pop-up dialog box. 3. To reset your browser settings: You can try to find the "Security and privacy" option in your browser settings and then set your browser's security to the default value or try to clear your browser's cookies. 4. install other browser: if you think that the browser is causing a pop-up dialog box, you can try to install other browser such as Chromefox, etc. These browser had better security features and functions to meet different needs. If the above methods cannot solve the problem, you can try to contact the browser's customer service or technical support for further help.