Hi — I can help. Short answer: because you used a retail key inside a VM then deleted that VM without deactivating, Microsoft’s activation servers still see that product key bound to the (now‑gone) VM hardware ID. The usual fix is to try the built‑in activation steps first and, if they fail, contact Microsoft Activation Support and ask them to reset the key so you can reactivate it on your current machine. Steps and exact things to try are below.
1) Quick checks (on the machine where you want to use the key)
- Sign into Windows with the Microsoft account you used to buy/register Windows (Settings > Accounts > Your info). If the license was ever linked to that account you may be able to restore it.
- Settings > System > Activation...