File Saved As Read Only? Can't Delete / Rename File

Hey everyone,

One of my managers is having a unique problem with Excel 2010. She is unable to save, move, or delete her excel file she uses for payroll.

When trying to delete or even just rename the file, the following error appears (see attachment). When going to "File" on excel, it shows the file was opened as Read Only, yet there are no other instances of the file open on any user (Has been happening for weeks).

I checked if this was from "Protected View" but that is always shown on the top when opening the file, which it is not doing in this case.

It's happening quite often with some of her files, and we can't save as a new file each time, as it will cause confusion, and she already printed the wrong file (we have to keep all files) today, so it's getting on her nerves having to work around it all the time. Also, we can't even delete this file if we save a new one to begin with, or rename it.

Any help with this issue would be greatly appreciated.