You CAN install Ubuntu from with in Windows in at least three ways:

1) WUBI http://wubi-installer.org/

In this case it installs inside Widows onto the C drive with no partitioning
necessary but runs independent of Windows when you reboot.

2) Inside a VM using VirtualBox or VMWare

3) Portable Ubuntu which uses CoLinux and actually runs in Windows as an
application would without a VM. http://portableubuntu.demonccc.com.ar/

I suspect that he meant WUBI and did not complete the installation, not
realizing that while WUBI install inside Windows that it is not used in
Windows. To do that you need a VM or CoLinux.