when running ccleaner a file can't be removed.
C:\Users\Bertil\AppData\Local\Temp\FXSAPIDebugLogF ile.txt 0 byte
tried deleting it with killbox to

is it harmful?

Looks like it is located in the Temp folder.

Download and install CleanUp!
*WARNING* Cleanup deletes EVERYTHING out of temp/temporary folders and does not make backups.

Open Cleanup! by double-clicking the icon on your desktop (or from the Start > All Programs menu). Set the program up as follows:
*Click "Options..."
*Move the arrow down to "Custom CleanUp!"
*Put a check next to the following:

• Empty Recycle Bins
• Delete Cookies
• Delete Prefetch files
• Cleanup! All Users
• Click on the “Temporary Files” and uncheck the box for “Scan drives for file matching” if it’s checked.

Click OK
Press the CleanUp! button to start the program. Reboot/logoff when prompted.

I found out what the file was . it was a file the fax, that had appeared for som reason, used.

thank you anyway.