此问题涵盖了确保已启用它的功能，听起来像是这样(以防万一，我正在将其链接).有时似乎还有2008和Visual Studio 2010的安装问题(在该链接中也提到)，并且

This question covers making sure it's enabled, which it sounds like it is (I'm linking it just in case). There also seems to be an installation issue with 2008 and Visual Studio 2010 (also mentioned in that link) sometimes, and this question covers that. We had the same issue on one of 2008 servers, and post an update, it finally worked (solution 2).