Erroneous Tasklist.exe

Erroneous Tasklist.exe

I¡¦m currently managing a Citrix-farm system based on Server 2008R2. In
the past, I had used a Powershell script to check for running
user-processes and restart them if necessary.
I used the tool ¡§tasklist.exe¡¨ with additional parameters to check if a
defined process is running under the logged-on user. Unfortunately the
tasklist.exe had stopped working for a few days now. Restarting it results
in an error message: ¡§Error: Not found¡¨ or ¡§Error: invalid class¡¨.
Since the servers are in Germany, I have translated the message from
German to English. On the German server, it¡¦s called ¡§Fehler: Nicht
gefunden¡¨ and ¡§Fehler: Ungultige Klasse¡¨. So, I¡¦m not sure if the
translation to English is correct. There are no error logs in the event
log.
As it is a production system, there have been no changes such as updates
and there is no internet connection.
Is it possible that a dll registration is missing? I¡¦ve check with
¡§depends.exe¡¨ for anything that might be amiss but I¡¦m not able to
identify any difference between a working server and the non-working
server.
I¡¦ve also checked if there are any errors when starting ¡§dcomcnfg¡¨ but
everything is ok.
A fresh copy of tasklist.exe from a working server did not work. The
problem isn't related to the exectuable itself.
Virus pattern are up-to-date (McAfee VDS 8.8 + ASE 8.8).
Does anybody have any suggestions on how I can get ¡§tasklist.exe¡¨
running again? Alternatively, I would like a solution with Powershell
commands that would help rebuild the functions of ¡§tasklist.exe¡¨ ¡V
it¡¦s not an easy task as I¡¦m not the best scripter. ƒº
Thanks in advance for your help, hints or suggestions!