When I first went to an Intel-based PC, I had a brief flirtation with Linux then moved to Solaris. I went Windows for Emerald, which is an ISP billing software. At the time it used a Windows-based client. Later it went web-based and I could use it in AWeb.
As time went on I started using my Windows PC for watching videos (movies) and what-not. As time went on and I supported Windows more and more I eventually began doing so much that Windows had become my primary platform.
My ex-gf used to remind me how I had only just gone to using a Windows PC (technically, I had a P100-based Windows 98SE box I used for Internet Connection Sharing, but it was never used for anything else and was "headless") after we started dating, which was around late 2000.