Norton Internet Security 2012- Installation Failure

I was happily using Norton Internet Security 2011 on Windows XP SP3. I removed this using the Norton Removal Tool to install Internet Security 2012. But the installation reached a point where I got the error message Installation Failed. I used Norton Power Eraser and removed the BHO it didn't like. I uploaded the error files to Norton, but I have no idea what the problem might be. No error files seem to have been left behind by the failed installation.

 

I've installed the application successfully on my laptop which runs under Windows Vista.

 

Help please. Thanks

 

David.