Hi Shakalakaah, welcome to the For Honor forums! Can you please do the following in this exact order?
1) In your task manager, find the following process: UbisoftGameLauncher.exe, and end the process.
2) After that, uninstall and reinstall Uplay PC from uplay.ubi.com
3) Run Uplay as an administrator.
If the issue persists after those steps, please try the steps on this FAQ and they should be able to help.