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I am not really sure about the fact what's wrong in your setup. I tested with WICED Studio 6.2.1 and checked -print-prog-name=cc1 and it was able to find cc1.exe which in my case was located at C:/Users/rroy/Documents/WICED-Studio-6.2.1/43xxx_Wi-Fi/tools/ARM_GNU/Win32/lib/gcc/arm-none-eabi/7.2.1. Could you check in your non-working setup do you have the cc1.exe is in your local FS?
I have seen somewhat similar issue with mingw. I got the error removed in my WIN10 64 bit by adding <mingw install directory>\libexec\gcc\x86_64-w64-mingw32\<version_string> to the path. You can also try on similar lines with the location of cc1.exe