iTunes 5 and Updater wont install

This very thing happened to me several times today! Frustrating as **ll! Then a little box that said iTunes and Quicktime kept popping up and wouldn't go away. Also, you cannot delete the new iTunes setup file either - it kept saying Access Denied. I had to keep rebooting to get rid of the dialogue box. There clearly is something wrong with the file, in my nbho! Did you also get a message about a digital signature couldn't be verified? Here is how I solved it after much huffing and puffing - I went to Start-Settings-Control Panel-System-Hardware-Driver Signing and clicked the Ignore button and then ok. I disabled my Virus protection and went to the Quicktime part of the Apple site, not the iTunes part and downloaded Quicktime 7 and it automatically downloaded iTunes 5 successfully. So, in a round about way, I was able to get it. If you are concerned, you can go and switch back to the original setting in the System part of the Control Panel after a successful install. Hope this helps! Clearly, something is wrong with the new iTunes.