Invalid signature on iTunes update and iPhone software update

I have a problem, which has stopped me from updating to the latest version of iTunes and the latest iPhone software. This has caused my iPhone to crash during updating and now needs to be restored, but cant as I cant update to the latest version of the software!
The long story is that for the past few weeks I've been having problems downloading new music, or films from the iTunes store, sometimes saying the file is corrupt, and basically being very hit and miss.
When my phone tried to update to the latest software this weekend, it crashed during the install and now needs to be restored.
I called Apple and they suggested deleting itunes and starting again. They also suggested trying this with my antivirus turned off!
As I recently bought Windows 7 Home Ultimate, I decided to try and start from scratch and removed iTunes, Quicktime, my antivirus (Virgin Media's own) and install Windows.
This worked fine, but now I cant install iTunes at all, I have the setup file downloaded and click on it and nothing at all happens. I've tried running it in different compatibility modes, and still nothing.
I now cant download the antivirus software either as it states there is an error.
There seems to be something stopping me from downloading, saying signitures are invalid, there are errors, or files are corrupt.
My internet connection still works, although I'm worried about using it as I have no Firewall, antivirus etc.
Sorry for the rambling post, but I wanted to give as much info as possible..

Yeah, this problem continues to exist and no one ever has the answers to this problem. I've monitored this problem for over a year and yet Apple and Microsoft has again and always dropped the ball. I've read and tried all the articles people direct you to to help resolve this, and nothing. I am so sick of almost having to get get a degree in Computers to fix these problems that shouldn't exist. I think this may actually be me last IPOD I ever purchase if I am going to have these issues all the time. Sorry this is happening to you dude, but it doesn't surprise me one bit.

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