A digital audio workstation, otherwise known as a DAW, usually takes the form of an electronic keyboard (of the piano kind) combined with a screen and some software to allow you to create and edit music. You can also get DAW software for Windows, which you can connect to a keyboard and/or a microphone in order to record songs and tunes.
Zynewave Podium is a DAW product for Windows, the full version of which costs $50. But there's also a completely free version available, which lacks some of the more advanced features but which is still fun to play with.
The download is at http://zynewave.com/podium-free/ and is a 16 MB zip file which is malware-free according to VirusTotal and Web of Trust. Once you extract the zip file there are 32- and 64-bit installers to choose from.