windows 7 remote desktop server does not work

A week ago, my Windows XP running under VirtualBox crashed. I decided to install Windows 7 due to some office purchased licenses that I can't use Windows XP anymore for the new installation. Windows 7 is so slow... just like Windows Vista. But more importantly, when I am over VPN connection to the office and I connect with Remote Desktop from my linux to this Windows 7, it is fucking slow. Slow like a
turtle. It does not work. When I used this rdp with Windows XP, it was working fine. NOT this slow. Fuck off... oIIo