Hi JOGO, and welcome to BC.
The information below explains what the cisvc.exe is and does. If the process continues to run excessively you may have a bug. I would suggest downloading and running Spybot Search and Destroy
The cisvc.exe will monitor the memory usage of the Content Index Service (CIDAEMON.exe). If the content index service begins to use too much memory, cisvc.exe will terminate it so that it does not impact of the computer's performance.
cisvc.exe is flagged as a system process and does not appear to be a security risk. However, removing Content index service may adversly impact your system.
The Spy Bot database currently registers cisvc.exe to Microsoft.
This is part of Microsoft Windows.
We are always willing to help here, but do remember that google is your friend.