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This usually happens if the hard drive name has changed. In Finder, click on Finder menu and select Preferences. Under General tab, enable hard disks. This will show your hard disk in desktop.
Now click on the hard disk icon and press return. This will allow you to change the name. Change the name to Macintosh HD or HDD.
Click somewhere and the name will be changed. Now open Word or Excel and try to save now.
Please let me know if that didn't work, so we can continue troubleshooting.
Hello Christine, I'm just checking. How is it going ?