After OS upgrade to Windows 7 from XP, my .exe stopped working. The error message says: "The program can't start because mclmcrrt77.dll is missing from your computer. Try reinstalling the program to fix this progblem."
I tried to rerun MCRInstall.exe but it didn't help. (MCR v7.7)
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Possibly a PATH problem. See this solution
Question: did you go from 32 bit to 64 bit? If so then you will need a different MCR, I believe.