How to install window service In windows 7 with Installutil

I had made a simple window service in VS 2010 and try to install it but getting error Access Denied.

When I run the command as
InstallUtil "Path to Service" then a message box is appear which asked for username and password but after filling that getting error that either no mapping is done for the user or Access denied

Please help me I had stuck alot in it

Your feedback will appreciated a lot.
Neeraj Sharma

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