Hi, I am getting this message when trying to save a ttx file

please can someone at SDL help  reply?  Hi, I am getting this message when trying to save a ttx file: The process cannot access the file C:\Users\lilab\UpData\Local\Temp\SDLTempFileRegen\n5d2tmjt.so4    because it is being used by another process.     But there is no process! nothing. restarting the software or the pc have not worked.