Error in Nuget in VS 2010

I am getting the below error when i try to open "Add P开发者_运维问答ackage Manager" GUI in Nuget. But i am able to add/remove package successfully using Powershell console. I am using visual studio 2010 Ultimate RtmRel.

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Microsoft Visual Studio
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Unspecified error (Exception from HRESULT: 0x80004005 (E_FAIL))
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OK   
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Any idea why the GUI is not working ?

Thanks in advance!

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Known bug:

http://nuget.codeplex.com/workitem/580

See the comments for some workarounds