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
1603 — Fatal Error During Installation
A generic installer failure code — the real cause is almost always in the detailed install log, but common triggers are permissions, a locked file, or insufficient disk space.
1618 — Another Installation Is Already in Progress
Windows Installer thinks another install is running, even if nothing visibly is — usually a stuck installer process from a previous attempt.
1601 — The Windows Installer Service Could Not Be Accessed
The Windows Installer service itself isn't running or responding.
1602 — User Cancelled Installation
The installer detected what it interpreted as a cancel action, sometimes triggered incorrectly by antivirus software or a UAC prompt timeout.
2503 — Could Not Access Network Location (Installer)
The Windows Installer service doesn't have the permissions it needs, often due to a folder permissions issue on Temp directories.