Can't rename or delete a folder in win 10, msg: the action cannot be completed because a file or folder in it is open in another program

You have to close the program that has the folder open. Run the handle tool to search for open file handles.

https://learn.microsoft.com/en-us/sysinternals/downloads/handle

From an admin command prompt run handle.exe followed by the folder name.

You can use a free tool like IObit Unlocker
It will be added in Righ-Click Explorer Context menu, allowing to unlock and delete easily locked files/folders

Try to empty the temp data folder and Recycle Bin firstly.
In the Windows search box type %temp% and press Enter. You will be taken to the C:\Users\username\AppData\Local\Temp folder. Delete all the files in this folder.
Besides, use Process Explorer, when you right-click, you also have the ability to Kill Process Tree, which will also close any other associated processes. Now try to copy or move the folder or file that was giving you an error.
Get Process Explorer from here:
https://learn.microsoft.com/en-us/sysinternals/downloads/process-explorer

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