Hmm could you please post the message completely and literally? A screenshot is even better. Since that error is rare (i know a lot of people who use win7 64) it might help in finding the reason. Please also tell us where you downloaded it from (webserver or torrent).
If it doesn't work you can try running it without the installer. I can upload one to a server, but it will take some time and you would need to trust me (running binaries uploaded by anonymous people is not really recommendable). I wont upload if nobody wants to download.
Anyway, it's important (for ryzom) that we get the error tracked down. It might be related to some win7 update. Since the ryzom folder can be copied easily (no install required) not many players use the installer after they successfully installed the game once. Thanks for bringing the problem to our attention, most people will simply turn away if the installer doesn't work.
If it doesn't work you can try running it without the installer. I can upload one to a server, but it will take some time and you would need to trust me (running binaries uploaded by anonymous people is not really recommendable). I wont upload if nobody wants to download.
Anyway, it's important (for ryzom) that we get the error tracked down. It might be related to some win7 update. Since the ryzom folder can be copied easily (no install required) not many players use the installer after they successfully installed the game once. Thanks for bringing the problem to our attention, most people will simply turn away if the installer doesn't work.