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Q. Start-up screen came up but freezes halfway
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A. You need to fix possible problems in Microsoft .NET Framework 3.5sp1 library by installing it again by getting the code from Microsoft Support Site.
http://www.microsoft.com/en-us/download/search.aspx?q=.net+framework+3.5
If you are on Windows7, you need to re-install Windows7 because the library is a part of Windows7.