Windows & Office Error Code Lookup
Search by error code (like 0x80070005), stop code name (like IRQL_NOT_LESS_OR_EQUAL), Excel formula error (like #REF!), or plain description.
Don't have an exact code yet? See common Windows error messages explained in plain English first.
5 results
0XC004F074 — Activation Server Determined the Specified Product Key Is Blocked
Usually appears with volume-license (KMS) activation when the activation server can't be reached or the license count is exceeded — less common on typical home PCs. It can also mean the specific key has been flagged as blocked, separate from a connectivity issue, most often when a Multiple Activation Key (MAK) has exceeded its allowed activation count or the key itself was reported as compromised.
0X8007007B — The Filename, Directory Name, or Volume Label Syntax Is Incorrect
Despite the confusing wording, in an activation context this usually means the product key was entered or read incorrectly — though it can also point to corrupted system files, or, on a business/volume-licensed device, a KMS (Key Management Service) configuration issue rather than the key itself.
0XC004F050 — The Software Licensing Service Reported the Product Key Is Invalid
The product key entered doesn't match a valid Windows license, was already used elsewhere in a way that conflicts with this install, or — a specific, common cause — the key is for a different Windows edition than what's actually installed.
0X803F7001 — Digital License Not Found for This Device
Windows can't find a valid digital license tied to this specific device — common after major hardware changes like a new motherboard, or when the Microsoft account the license is actually linked to isn't the one currently signed in.
0XC004C003 — The Activation Server Determined the Specified Product Key Has Been Blocked
One of the most common activation errors — the key itself has been specifically blocked, which is a different situation from a typo or a temporary connectivity issue. Common real causes: the key was resold or leaked and Microsoft blacklisted it, it's been used on more devices than its license allows, or a major hardware change (especially a motherboard swap) disconnected the digital license from this specific machine.