Unable to go to design view in VS 2008 after installing RIA

On my aspx pages I see just a white scre开发者_JAVA技巧en, no controls, after installing RIA and Silverlight.

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I had some trouble installing Silverlight too. What I had to do was:

1) Install VS from scratch. 
2) Install VS service packs. 
3) Install silverlight. 
4) Install VS tools for silverlight.

Then it worked for me.