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Purchasing OEM keys from companies like XYZ at significantly lower prices can be risky. OEM keys are meant for pre-built computers and are usually tied to the hardware they were originally installed on. When these keys are resold to individuals, it may violate Microsoft's license agreement, and the keys could be obtained through unauthorized channels. If you buy and use such a key, it might not work properly, and Microsoft could deactivate it later. You may also not receive support from Microsoft, and there's a chance the key won't be valid in your region. For a secure and legal option, it's better to buy a Windows license directly from Microsoft or a trusted reseller.