Hi Wayne

Yes, working with admin & standard accounts certainly causes its share of problems. Have a look at the workaround below and see if it helps!!!

You might be the only account on the machine, but you're probably a "Standard User"

So what you now need to do is the following:

Go into Control Panel, go into Administrative Tools and then go into the Local Users and Computers, you will need to enable the Administrator account and maybe specifiy a password then log off.

You can now log on as the Administrator and uninstall iTunes.
What I would do now is upgrade your account from Standard User to Administrator.

You could also disable the requirement for UAC to elevate your credentials when working with programs but you will have to deal with the security centre complaining that your computer is at risk every time you log into Windows.

Once you sort out the accounts and the permissions and get used to this feature it's not so bad.

But it is annoying.