Try it with a
correct URL:
<html>
<head>
</head>
<body>
<img src="file:///C:/Sunset.jpg" width="150px" height="150px" >
</body>
</html>
That'll do for FireFox (proven) and probably Chrome too.
A file URL has to start with schema file:/// and you should always use only forwared slashes (/) instead of backward ones (\).
Best Regards,
Manfred