Insufficient privileges?
I looked around and someone said they fixed this problem by changing the installation directory from C:\Program Files\iTunes to C:\Program Files\iTunes_2 so that the installer wasn't trying to overwrite the old files or something. I tried this and it did not fix the problem. Additionally, I tried running the file as an administrator (even though I am the admin), and that didn't work either.
Any help appreciated, thanks.
HP Pavilion dv6000, Windows Vista