Windows watermark is suddenly appearing on my monitor.

[Windows Server]

Hello, I built my pc last February , and booted it up with Windows 11 home. And now just yesterday, 10 months later, a watermark has appeared on my main monitor that says "Activate Windows. Windows is not activated on this device." There was what I believed to be a routine security update, that I proceeded with, for my PC last night. And turning my PC on this morning, I noticed the watermark, and that one of my applications on my desktop, was just gone. Other than those two things, my PC is running as normal. But the watermark is very annoying due to it bleeding through everything on my screen

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