There are three ways to change the default PDF opening method to your desired application: through File Explorer, System Settings, or Control Panel. First, you can right-click on any PDF file and select "Open with" and check "Always use this app"; secondly, enter the "Default Application" setting through [Win I] and specify a program for .pdf; you can also manually associate it through the "Default Program" function of the control panel. If it is still changed after setting it, you need to check whether the security software has reset the association, and make sure that the PDF reader's own settings have been set to default to avoid conflicts between multiple PDF software and lead to unstable association.

Turn on incognito browsing in UC Browser to protect privacy. Select "Incognito Browsing" through the tab icon on the main interface or slide the sidebar to enter "Incognito Mode". You can also create a desktop shortcut in the settings. After startup, a prompt will be displayed at the top of the page and the operation will leave no local traces.

You can cast mobile videos to your computer through QQ browser cross-screen traversal, Miracast mirroring or third-party software. First, make sure the device is connected to the same WiFi, use the same QQ account to log in to the QQ browser on both the phone and the computer, click the "Cross-Screen Travel" button on the video playback page and select the target computer to complete the screencasting; if the computer supports Miracast, you can click "Screen Mirroring" in the phone control center to select the computer name to connect; you can also scan the QR code through third-party software such as ApowerMirror to achieve high-definition transmission.

Changing the default search engine first can solve the search problem in the address bar of Google Chrome. Especially in China, the instability of Google services can easily lead to search failures. Go to Settings → Search Engine → Select a commonly used Chinese engine such as Baidu or Sogou → Test the search function. If it is still abnormal, check whether the proxy settings are reasonable and eliminate network restrictions or firewall interference. Then clear the cache and cookies, disable ad blocking plug-ins in the extension, and check one by one whether it is caused by plug-in conflicts. The search function can usually be restored by changing the engine and eliminating network and plug-in interference.

First clearing cache and history can solve the problem of slow loading or abnormal display of UC Browser. Specific operations include: clearing cache, browsing history and cookies through UC Browser settings menu; clearing cache separately in "Downloads and Cache" to retain login status; or force clearing UC Browser's cache and data through "Application Management" of the mobile phone system to free up storage space and improve browsing performance.

First, switch to IE compatibility mode through the "lightning" icon in the address bar. Secondly, you can add the website to the compatibility mode whitelist in the settings to achieve automatic loading. Finally, you can modify the registry HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\I nternetExplorer\MAIN\FeatureControl\FEATURE_BROWSER_EMULATION, create a new DWORD value named QQBrowser.exe and set it to 8000 (hexadecimal) to force IE8 rendering mode to be enabled.

First, adjust the hardware acceleration settings, close and then restart the Edge browser; second, update or reinstall the graphics card driver to improve compatibility; then clear the GPUCache folder in the ShaderCache; and finally, reset the browser settings to eliminate abnormalities.

First check and install the target language pack, go to "Settings - Time and Language - Language" to add the required language and install the language pack; then move the language to the top of the preferred list or set it as the default, and it will take effect after restarting; if the options are limited, you need to enable alternative display languages through the "Advanced Settings" of the control panel; if it still does not work, use DISM and SFC Use the command to repair system files; you can try to modify the registry HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MUI\UILanguages to add language codes; finally, create a new user account to eliminate configuration corruption problems.