I have QV Server 9.00.7440.8 SR3 64-bits installed an running ok. Now I'm trying to install 'Microsoft IIS support' and after introducing user name and password for the service I get this error: 'Installation ended prematurely because of an error'.
OK. So if the error is only happening when you introduced IIS support, what OS are you running? Make sure that the World Wide Web Publishing Service and the IIS Admin Service are started. In IIS, make sure that your Default Web Site is started and is not reporting any errors (such as blocking on port 80). If all else fails, do a full uninstall and reinstall. You shouldn't lose any data or settings since the QVPR and all the XML files will remain intact.