This really worked:
- Start in Safe Mode
- Log in as Administrator
- In My Computer, rename (may not be necessary)
- Right click on the file and choose Properties.
- Select the Security tab.
- Tick "Full control" which automatically ticks all the other boxes as well.
- Click "Apply" and then "OK"
- On the file, right click and "delete".
I had hundreds of sub-folders with these EULA files. They were all Microsoft warnings about the use of some Microsoft product I had downloaded, in about fifty different languages. Don't you just hate the sheer arrogance of Microsoft stopping you controlling your own computer?
This worked for me. After rebooting several times they have not reappeared. I now need to check what other crud was installed by Microsoft without my consent, and take back control.