I also read stories by medical technicians at a Toronto hospital. They switched some medical computers from proprietory system to Windows. The technician wrote that compared to their old systems, the Windows ones are much slower nd unstable and they crash occasionally.
I can absolutely confirm this. I'm a service engineer for a company making automated blood testing equipment, and their latest machine was supposed to be faster, cheaper, more reliable, more compatible, more user-friendly etc. than the 15-year-old design with DOS-based software. It runs on Windows 2000, and about 40% of the problems we have are Windows-related, be it print queues, communication issues, timing problems and so on. Andthis is nearly 4 years since the first batch were released for sale. The DOS-based machines, running on 486s are more stable, faster to process results, faster to print, easier to navigate and generally nicer to work with.