Your batch file gives the parameters to be passed to minerd.exe but never actually tells the batch file interpreter to run minerd.exe. It should rather be:
(if minerd.exe is on the path or in the current working directory you can simply use minerd.exe without specifying the full path)
Code:
C:\path\to\minerd.exe -a --scrypt -t 6 -s 4 -o stratum+tcp://aikapool.com:7915 -u man_cubus.paybills -p money
(if minerd.exe is on the path or in the current working directory you can simply use minerd.exe without specifying the full path)
AND ... if you want the Command Prompt window to stay open (so you can monitor progress) ... add the word "pause" (no quotes) to the end of the stuff in the Batch file