Well, if you have the latest release available (v3.1) there is a special action named "Terminate Process" or sth. Notice that in order to get this release, you will have to send an email requesting it from the support department since officially it is beta (even though it is actually a very stable version).

If you do not want to use v3.1, you can just use the "Run DOS Command" action and send something like this:

taskkill /F /IM "proccessname.exe"

For example, if you want to terminate the notepad process you should write:

taskkill /F /IM "notepad.exe"

Notice, that the taskkill tool is not available in the Home version of Windows (I know that for sure at least for XP)

Thanks for your quick reply.

This trick is working fine :)

Thanks again.

 No problemo!