You could use pslist and pskill, two standalone programs that work very well, and can be used also when you're not in the middle of a Perl script - they are mentioned here

Also gnu.org has Windows ports of common Unix utilites (no need to install cygwin or other libraries - they're statically built) such as kill, ls, sed, grep, etc etc .. using these you can do lots more from the command line in Windows.

Sorry I can't find the link, but if you search the gnu.org site you'll find a package of Windows ports in one of the Software sections .. I remember it was well hidden though..

Update: Here is the link for the GNU ports (it wasn't on gnu/fsf, it's on SF) UnxUtils