Progress : put the C:\Program File\....\nmake.exe string in quotes , in MyConfig.pm file , now installed YAML successfully.

Trying JSON::XS, which throws error :

'pl2bat.bat' is not recognized as an internal or external command,oper
+able program or batch file.
[download]

Trying with bin dir appended to %PATH%

UPDATE: JSON::XS and JSON installed successfully.

Summary : 1. Strawberry perl had set environment variables which affected my instance of perl. 2. MyConfig.pm file isn't set right by default for Windows paths which often contain spaces. Need to put such path strings in quotes. 3. Need to run vcvars32.bat and ensure perl/bin is in %PATH%

Thanks to all monks!