Check if port 80 is not used by any other service such as IIS on the system. If it has to be used by that service, change the QlikView Web Server port to something relevant(that is not used by any other service) to your system at the location :
Documents and Settings\All Users\Application Data\QlikTech\QvWebServer\config.xml
as it is a win 2008 server, it must be under Program Data folder which is a hidden one.
Reply if this helps or not.