When trying to install update 10.5 it says the download has invalid signature and won't install. I run XP

when trying to install update 10.5 it says the download has invalid signature and won't install. I run XP

I'm having similar problems with 10.5. I managed to install it but when I try to run itunes it doesn't open correctly and when I view my account the screen is not presented in the correct format. When I try to search for music it finds nothing. So I ran the diagnostics option but this came back with an error ' secure link to itunes failed'. It also said that the internet connection was verified but when I went into the help option it said I wasn't connected to the internet but as you can see I was and am. I've now uninstalled and reinstalled 3 times, each time I uninstall I've followed the correct sequence as recommended:-
1. Itunes
2. Quicktime
3. Apple software update
4. Apple mobile device support
5. Bonjour
6. Apple application support
I've noticed now that 'quicktime' didn't get reinstalled, not sure if that's the problem. Also when I rebooted after the last Uninstall I received a new error message ' Applesyncnotifier.exe - unable to locate component'. I've also noticed that my CPU is running at 50% according to task manager when I've got apple loaded, but it goes down to less than 20% when it's uninstalled and even goes down to 0%. Clearly, there are a number of people with similar issues and Apple need to sort it quickly.

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