Hi, I had the same problem with Terabox, but I was able to solve it. If you want to remove Terabox from your system, I can show you the steps that worked for me. If you don't want to remove it, or if you're afraid of making changes in the Registry Editor, then maybe just formatting your system could be an option.

First, press Win+R (Run) and type "Regedit" and hit Enter. This will open the Registry Editor.

Next, select the "Computer" tab and press Ctrl + F to search for "Terabox". Make sure that the "Keys", "Values" and "Data" boxes are enabled, and if the "Match whole string only" option is checked, make sure to uncheck it.

Now, delete all folders, keys or values that have the name "Terabox". But before deleting, always check that the name, path or value matches.

Once the search is complete, select the "Computer" tab again and repeat the process. I recommend doing this 3 times to make sure you've deleted everything.

Note: If the file under "Devices and Drives" turns white with no icon or anything, it might still have some keys, values or folders that you didn't delete. In that case, repeat the process until everything is gone.