Itunes help

I am trying to install Itunes on my XP machine and I'm getting invalid certificate so Xp wont install it. I have sp3 running. Can any one help me with this issue

First thing would be to download it again, then try. Maybe your first download got corrupted somehow.

I tried to redownload itunes 3 times, all three time it says invalid certificates, Is there a way that i can get around the security of windows just for Itunes

I sorry the exact error message is "this file was blocked because it does not have a valid digital singnature" I am trying to download this from the apple website directly