The first method. Log in to qq. (Don't log in, I mean open the login dialog box) Delete your number once. The x at the back will do. Select Delete all records for this account.

Alternatively, you can delete QQ information from the folder and log in again. This method should work.

= = = If this method doesn't work, you can reinstall it, but install it in a different folder.

= = = = If it still doesn't work. First, uninstall qq, use cleaning software to clean the computer (including junk files and registry) or manually delete all qq-related files. Second, reinstall qq after restarting the computer.

However, it should be noted that this method will also delete chat records and custom expressions, if it is important to you. Please back up in advance.