That is very strange problem.I don't have any idea about 5.1b but you can upgrade from 5.1 to 5.1U1a.While upgarding VC from 5.1 to 5.1U1a then you will get an option on databse wizard called a dynamic port.Just select the check box and provide the correct instance Name, in your case it is "MSSQL$VIM_SQLEXP".I hope it will work fine.
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