If you are running a windows system, it can be difficult to setup several pristine drupal development environments. The simple solution is to install a virtual machine, setup your drupal such that it has no affect on the rest of your system. A better solution is to use a virtual machine workflow system that will allow you to easily create and work with several virtual machines. Vagrant is such a system and in here you will learn how to set it up.
|vagrant up||start vagrant|
|vagrant halt||stop vagrant|
|vagrant reload||restart vagrant|
|vagrant box list||list vagrant virtual boxes|
|vagrant box add box-title url||add virtual box|
|vagrant box remove box-title||delete virtual box|