If you've tried to install 64-bit 5.3 side-by-side with 32-bit 5.2b on the same machine, you've probably found that installing 5.3 breaks your 5.2b installation (e.g., http://community.logos.com/forums/t/88363.aspx).
If you're in this situation, there's a workaround you can try. Please install the "vcredist_x86.exe" Visual C++ Redistributable for Visual Studio 2012 Update 4 from http://www.microsoft.com/en-us/download/details.aspx?id=30679
Please let us know if that works (or doesn't work) for you.
