[all variants] best option for installing ubuntu on a windows pc

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http://ubuntuforums.org – What is the best option for running Ubuntu and Windows 7 on an used Desktop? It already has Windows 7 on it. == Install Ubuntu with wubi.exe == Ubuntu on live a USB == Ubuntu in a virtual box == Dual boot == Windows 7 in a virtual box Specs: Dell ultra small form factor, 2 GB memory, Intel Pentium, 75 GB HDD, Windows Vista era Things to consider: This is my old desktop computer that I don't spend much time on, so I want to keep things low maintenance on the Ubuntu side. Is Ubuntu on a live usb the best option? Say maybe Ubuntu 10.04.4 on a 4 GB flash drive with only security updates. (Hardware)