Perhaps your user account has become corrupt?
- Are there any other odd things happening?
- If you open a cmd prompt window and type in echo %UserName% does it report back correctly?
An immediate fix, that addresses the reported symptom rather than the problem itself, is
- Paste this [including the funny symbols] into your File explorer address bar to get to your Desktop folder C:\Users\%UserName%\Desktop [unless you have previously & deliberately relocated it somewhere else in which case just browse there instead.- - Select the existing text in the address bar by clicking somewhere to the right where it is empty, as indicated by the purple smudge in this diagram, then right-click Paste.
- -
- select the Desktop folder itself rather than the files in it,
- right-click on it,
- select Properties,
- select the Security tab,
- Click on the Advanced button,
- near the top of the dialog that appears, on the line starting with Owner,- - either report back if it already shows your username there,
- - or click on Change,
- - - then in the large text box that appears, type in your user name then click on the Check names button,
- - - when it retrieves your username, click on the OK button,
- - - select your username again in the dialog [that you saw earlier] that it has now fallen back to,
- - - Click on the Add button,
- - - Where it says Select a principal, enter your username as before, Check names, OK,
- - - set the Full control checkbox & click on OK
You can set your UAC back to maximum.
All the best,
Denis