Been using Itunes 7.something for ages now so finally decided to upgrade today. It prompts me everytime I start iTunes so just clicked upgrade, popped up with a random error saying it couldn't after it had downloaded the update.
Fine, I'll grab the installer from the website and do it that way, but I get the following error a few times while installing:

At the end it says the software has installed fine but won't run giving the following error:

I've tried fully uninstalling iTunes and am working my way through old installers now but getting the same issue. Tried the 32 bit installer but kicks up a fuss and says I need the 64bit one.
Win Vista x64
Help!
Fine, I'll grab the installer from the website and do it that way, but I get the following error a few times while installing:

At the end it says the software has installed fine but won't run giving the following error:

I've tried fully uninstalling iTunes and am working my way through old installers now but getting the same issue. Tried the 32 bit installer but kicks up a fuss and says I need the 64bit one.
Win Vista x64
Help!
