Why Windows says "not genuine"
The message is vague on purpose, and it covers several unrelated situations. Some are a five-minute fix you can do yourself. One cannot be fixed by anyone, and it is better to know that quickly than to spend a week trying.
Start by reading the actual status the watermark tells you almost nothing
Before changing anything, find out what Windows actually thinks. Open Settings, then System, then Activation. That page states whether Windows is activated and, when it is not, gives an error code.
For more detail, open Command Prompt as administrator and run slmgr /dlv. It reports the licence type, the partial product key and the licence status. That single screen usually identifies which of the situations below you are in, and it costs nothing to look.
Write the error code down. Every fix from here depends on which one you have.
You changed hardware by far the most common cause
Windows ties an activation to a hardware fingerprint, and the motherboard dominates it. Replace the board — or in some cases the drive and memory together — and Windows sees a different machine and deactivates.
If your licence is retail and linked to a Microsoft account, this is genuinely a five-minute fix. Go to Settings, System, Activation, and run the Activation Troubleshooter. Choose "I changed hardware on this device recently", sign in, pick the old machine from the list, and it reactivates.
If the licence is OEM, it will not come back. OEM licences bind permanently to the first motherboard they activate on. That is the defining condition of the type, not a fault, and no troubleshooter can undo it.
The licence expired or was time-limited evaluation, volume and subscription builds
Not every Windows licence is permanent. Evaluation and Insider builds expire. Volume licences activated against an organisation's KMS server must re-check in periodically — typically every 180 days — and a laptop taken away from that network eventually stops being able to.
If slmgr /dlv reports a KMS client channel and you are not on the organisation's network, that is your answer. The fix is to reconnect to that network or ask its IT department, because the licence belongs to the organisation, not to the machine.
The key was sold outside its terms the case nobody can fix
This is the hard one, and it deserves a straight answer rather than a workaround.
Very cheap keys are usually volume keys issued to an organisation, or keys locked to a region and resold elsewhere. They activate perfectly at first. Microsoft audits the agreements those keys came from, and when a block is found to be misused it is deactivated — sometimes many months after you paid.
When that happens the software was genuine, but the right to sell it to you was not, and there is nothing to repair. No reseller can restore it. Anyone who tells you they can reactivate a deactivated volume key is either mistaken or selling you another one.
To be plain: we are an independent reseller, not Microsoft and not an authorised Microsoft partner. We cannot restore a licence Microsoft has deactivated, and neither can anyone else outside Microsoft.
What to do next in order
Work through these in sequence. Stop when it activates.
- Read the code in Settings, System, Activation, and run
slmgr /dlv. - Run the Activation Troubleshooter and use the "changed hardware" path if you have.
- Sign in with the Microsoft account the licence was linked to, if there is one.
- Check the licence channel. Retail can move; OEM cannot; KMS belongs to an organisation.
- Contact Microsoft support directly. They can see the licence history and are the only party who can reinstate one.
If the licence turns out to have been deactivated, buy a retail licence from Microsoft or a seller you can hold accountable. Do not buy a second cut-price key from the same source that sold you the first.
Common questions
Does the watermark mean my Windows is pirated?
Not necessarily. The most common cause is a hardware change on a perfectly legitimate licence. Read the error code before assuming anything.
Can I still use Windows while it says this?
Mostly yes. Personalisation is disabled and the watermark stays, but the system keeps working and continues receiving security updates. It is a nag, not a shutdown.
I replaced my motherboard. Can I get my licence back?
If it is retail and was linked to a Microsoft account, yes — use the Activation Troubleshooter and the "changed hardware" option. If it is OEM, no. That licence ended with the old board.
I bought a very cheap key and it stopped working. What now?
It was most likely a volume or region-locked key resold outside its terms and later deactivated. There is no repair for that. Buy a proper retail licence and treat the first as a loss.
Are those tools that remove the watermark safe?
No, and we will not link to any. They work by tampering with the activation system, they are frequently bundled with malware, and they leave you no closer to a valid licence than before.
Can you reactivate a key that Microsoft deactivated?
No. Nobody outside Microsoft can. We are an independent reseller with no authority over Microsoft's licence servers, and any seller claiming otherwise is not being straight with you.
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We sell genuine licences with real activation. We are an independent reseller, not the vendor, and if a free option covers what you need we will say so.