She says it's linked to the drives on her computer renaming themselves a couple weeks ago. For example, her external HDD used to be labeled 'G', but is now 'E', breaking access to programs that were installed on the drive, such as Photoshop. An attempt to open Photoshop will result in a "disk not in drive" error.
I was going to advise her to take a look at her BIOS, as I think the problem may be presiding there. She's not the most tech-savvy of people though

Any help would be appreciated.