Remote desktop won't works from RDP but not from any computers

Hi, first post here! Simply cannot figure out what is wrong with the new windows 7 machine I built for my dad's office. It took the place of another pc to which remote desktop forwarded so I was able to get it up and running fairly quickly, but while I can connect to the pc via remote desktop, I can't actually log into it using the correct username and password. This is on a windows 7 machine, a windows xp machine and a macbook pro.

However, the remote desktop connection works flawlessly from my iphone with RDP or from Logmein. Anybody got any idea how to rectify this or what might be causing it

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