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Asked: 2026-05-13T14:27:10+00:00

I have developed a windows service using C# and Visual Studio 2008. I have Windows XP SP2

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I have developed a windows service using C# and Visual Studio 2008. I have Windows XP SP2 installed on my machine. When I try to install the service using the installutil tool, after entering the username and password, I get the following error.

An exception occurred during the Install phase.
System.ComponentModel.Win32Exception: The account name is invalid or does not exist, or the password is invalid for the account name specified.

But the user does exist. I had created the user through control panel → User accounts → Create new account.

The command I used for installing the service was:

installutil /i TestService.exe

How can I resolve the issue?

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1 Answer

  1. Editorial Team

    If the account is a local user account, try to use .\username when installutil prompts for the username and password.

    The .\ stands for local machine.

    Services require a fully qualified username (with domain), so when installing you need to be explicit about local user accounts.

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