I am having problem downloading iTunes on my computer. I had iTunes on my computer but then I created another profile and that messed it up. I removed iTunes from my computer and tried downloading it again. Everytime I do that, when it reaches the 'installing Quicktime" part, it gives me the error message "Can not access network %AppData% "
Strange enough when I logged in as "guest" and then switched to my login, without loggin off from guest profile (but just switching user), I was able to download iTunes again. Not that I have been able to sync it with my iTouch since it seems to have some version issue, which I will deal with later. But all the applications seem to be working now.
I have no idea what fixed it but that's what worked for me.