Using cpuminer 3.8.1.1 on win 8 with i7.  When i run bat file I get "cpuminer is not recoginized as an internal or external command"  any ideas what I am doing wrong?

bat is: cpuminer -a lyra2z330 -o stratum+tcp://hxx-pool1.chainsilo.com:3032 -u xxx -p xxx

bat file is in the miner folder.

I tried downloading again and extracting with 7z.