A Backgrounder on aircrack
Page from 2010
Full instructions and to download the executables for Aircrack for Windows 7.
MUSE Technologies has a full set of executables for Windows XP, Vista and Windows 7.
For those of you that have no Linux experience and have no desire to learn (that is why you probably bought a Windows powered netbook [or laptop] in the first place) a Windows tool is probably more use to you.
Aircrack is only one of many tools that can be used for WiFi auditing. If you are running Windows there may be better and certainly easier programs to install and use.
You can run aircrack-ng (airoscript) from a VMWare Player virtual appliance using any version of Windows as a host.