Check is you have SP1 installed with Visual Studio 2005

Source: http://damieng.com/blog/2007/01/19/how-to-spot-a-visual-studio-2005-sp1-installation

No service pack – Version 8.0.50727.42 (RTM.050727-4200)

Service pack 1 beta – Version 8.0.50727.363 (SP.050727-3600)

Service pack 1 – Version 8.0.5727.762 (SP.050727-7600)

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