Problems download itunes

I have just recently purchased an Ipod Touch 8GB for my sons birthday and I am trying to get it set up for him before his birthday. When I try and download itunes it goes fine until it starts downloading quicktime and I get the following message "The Intallation of Quicktime did not complete successfully. itunes requires quicktime" then I press OK and this message appears "The installer encountered erros before itunes could be configured. Your system has not been modified. To retry there operations at a later time, please run the installer again." I have looked on my laptop and I don't have any itunes or quicktime programs on it, so I can't uninstall. Your help would be much appreciated.