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Everytime I try to compile in Visual Studio 2010 I get the error

Unable to launch the ASP.NET Development server. Unable to start program 'C\path.......\Webdev.Webserver40.exe

I also tried to execute this file (Webdev.Webserver40.exe) and I get this error:

WebDev.WebServer40.exe is not a valid win32 application

I already turned off every firewall I have, and I already tried changing the .NET framework of any project, changed to different speceific ports and it's still failing...

What could be happening?

I have Windows XP SP3

Peter Mortensen
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agarza
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1 Answers1

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I went through the same error. Seems like somehow the webserver embebbed in VS2010 got corrupted.

If you try to Debug a WebSite, the error is "Unable to launch ASP.NET Development Server".

If you try to Debug a Web Application, the error message points to the path of the server.

It's installed under this folder:

C:\Program Files\Common Files\Microsoft Shared\DevServer\10.0

The two executables WebDev.WebServer20.EXE and WebDev.WebServer40.EXE were really corrupted (getting error "not a valid win32 application" when try to run).

I had to go to instalation DVD and selected "Change or Remove Microsoft Visual Studio 2010" in the Main Menu.

After that:

  • Add or Remove features
  • Uninstall Web Developer

When the uninstalling is complete, do it again:

  • Add or Remove features
  • Install Web Developer

Now everything works just fine.

I hope the same resolve to you.

Sergey Glotov
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Thales Medeiros
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