Cyrille,
What is the error that you get when trying to install the run-time engine?
Are you installing it from the LabVIEW CD, or did you download it from the web site?
To further troubleshoot this problem, it would be best if you send us an email to support@ni.com and send the above information.
Also, try running the installer from the command prompt window, and use the following syntax:
setup.exe/l*v
This will save the error log to the file you specify. Send us also this file to help us troubleshoot.
Thanks
Zvezdana S.
National Instruments