Help, a double 11 banner appears on the desktop, how to get rid of it?

I don't have this on my computer. I don't know which software sent your advertisement. I've seen Universal Wubi, Oriental Input Method, and other softwares always pop up Tmall advertisements in the free version. I suggest you open the task manager to check the processes, end the user processes one by one, see which process initiated it, and locate the folder where this process is located. According to the name of the folder, you can tell which software initiated the advertisement (don't end the system process, you can see your current logged-in user in the process, and this kind of process tries to end one by one, and some processes that can't end don't care about it, such as advertising, which has low authority and will definitely end).