I have a Sony Vaio, 64 bit laptop with 4 GB RAM.
Before installing windows, I created portions as 50GB NTFS for Windows 7, 200GB NTFS & rest unpartioned for Ubuntu.
Installed Windows 7, which went through without any trouble.
Next I tried to install Ubuntu, but it is not happening.
While booting the ubuntu instaler DVD is not recognised, same with installer USB.