無法安裝silverlgiht tool 4

vs 2010安裝 silverlight tool 4 無法安裝, 出現

Visual Studio 2010 or Visual Web Developer Express 2010 or Visual Phone Developer Express 2010 that matches the language version of Silverlight Tools 4 must be installed before installation of Silverlight Tools can continue. Silverlight Tools is available in other languages at http://go.microsoft.com/fwlink/?LinkId=177432. 

試了很多方法..還是無法安裝, 最後參考這篇文章, 先移除vs 2010 SP1後, 就可以安裝tool了.

裝完後再重裝vs2010 SP1