Execute a shell script in UNIX m/c from win 7 using ksh

I need to run a shell script on unix machine from windows 7.
I used the "RSH" command in win XP successfully for this, But on win 7 it is not working.

Can any body tell me how to run RSH on win 7 or any other command for similar use.

I use the command as below

rsh <unix m/c> -l <username> <script full path>

What does "it is not working" stand for? Is it installed at all? Do you get error msgs?
You could use a different product like e.g. ssh .