Hello, I work for a company and we are working on refurbishing some older PCs and selling them. Before I started working here they were DBANd and it became my project earlier this week to get them ready to sell. After re-installing Windows 10 on them 90% of them are not activating. We do not have the activation keys as most of these were upgrades from W7. They do not seem to notice their digital licenses. Motherboard has never been replaced and it is the same version as before the DBAN. Any thoughts?