I have had two crashes where Win 8.1 would not load, due to an incompatible antivirus upgrade (Avast). I have got it running again, with a Factory Recovery program on an USB stick. All my programs were lost in the recovery, but I have successfully reinstalled Firefox, T'bird, etc. I have a legitimate Office 2013 suite, bought as a licensed download. The MS stores accept my login, Product Key, etc and let me download the Office 2013 suite again, but when I try to use Word 2013 it fails with the message: "Microsoft Office cannot verify the license for this product. Repair Office program by using Control Panel" I have followed this instruction twice, and downloaded & reinstalled Office 2013 three or four times, both direct from /stores.office.com/ and via the Control Panel "repair" option, but every time I try to use Word I get the error message and it closes down.
The machine is an Inspiron 3646, bought a little over a year ago, with Win 8.1 loaded, but no CDROM to reinstall the OS.
Does anyone know a reason and a solution? Many thanks.