Complete reinstall of your operating system from scratch.
Backup of current data if possible.
Erase and clean install windows 10 or 11 ( if your unit is compatible)
Restore data to relevant locations.
Reinstall required/ supplied programs - MUST be genuine licenses.
NB - if programs like word and excel are older than 2016 , we would direct you to purchase a more recent version from us as part of the upgrade.