Windows 8 security user account permissions

I'm using Windows 8 Pro.
When I try to save an attachment from Outlook 2010 into a specific Program Files folder I get the following message:

"C:\Program Files (x86)… You don't have permission to save in this
location. Contact the administrator to obtain permission.

Would you like to save in the folder instead?"

I upgraded my Win7 pc to Win8. The first time I used Windows 8 I signed in via my email address (4 or 5?). But then I added it to our domain and signed in with my domain account (3).

Now when I look at the "Control Panel > User Accounts > User Accounts" I see the following things:

(1) HomeGroupUser$ | <pcname> | HomeUsers
(2) UpdateusUser | <pcname> | HomeUsers
(3) <my current domain user (globe icon)> | <my domain> | HomeUsers; Administrators 
(4) <my first sign in user email address (pc icon)> | MicrosoftAccount | HomeUsers; Administrators 
(5) <my first sign in user email address (globe icon)> | MicrosoftAccount | Administrators

the "my domain user (globe icon)" (3) is the account that I use currently and It has been added to the "HomeUsers; Administrators" groups, but still that message tells me i'm not an administrator.

I also linked my MicrosoftAccount (4 or 5?) with my current domain user account (3)

Any suggestions on how to make myself an administrator on the pc so that I don't have these annoying UAC messages and that I can write in my own program files (and other folders)?
I thought I was an administrator now, because my domain account (3) is in the groups "HomeUsers; Administrators" but that doesn't seem to be 100% ok.

Thanks in advance (sorry if this explanation is a bit messy).