Burn ubuntu-14.04-desktop-amd64.iso to DVD and boot from it and choose "Try Ubuntu".
Run "GParted Partition Editor" and set up the following primary partitions:
/dev/sda1 ntfs windows 92160 MiB / 90.00 GiB
/dev/sda2 ext2 boot 1024 MiB / 1.00 GiB
/dev/sda3 ext4 ubuntu 143360 MiB / 140.00 GiB