Download the latest apache commons daemon from Apache Commons Project Distributions.
Extract the commons daemon in <Cassandra installed directory>\bin.
Rename the extracted folder as daemon.
Add <Cassandra installed directory> as CASSANDRA_HOME in windows environment variable.
Edit the cassandra.yaml file in <Cassandra installed directory>\conf and uncomment the data_file_directories, commitlog_directory, saved_cache_directory and set the absolute paths.
Edit cassandra.bat in <Cassandra installed directory>\bin and replace the value for the PATH_PRUNSRV as follows:
for 32 bit windows, set PATH_PRUNSRV=%CASSANDRA_HOME%\bin\daemon\
for 64 bit windows, set PATH_PRUNSRV=%CASSANDRA_HOME%\bin\daemon\amd64\
Edit cassandra.bat and configure SERVICE_JVM for required service name.
SERVICE_JVM="cassandra"
With administrator privileges, run cassandra.bat install from command prompt.