WinS3v3n64Bit - actually I started building my own TRS-80's from the beginning, buying a tape Model III and adding floppies, etc. I didn't want to mention the 8/16 bit Windows, because I used OS/2 until I started using Windows 2000 because I needed the linear address space for my main uses for the computer - running my own programs for scientific work.
My current build was a bit more than that because I wanted a lot of oats for my project at the time I built it last year, but my last power workstation went for seven or eight years before the buck converter on the motherboard got too noisy for it to boot. My signature photo is the LGA 771 socket on that motherboard. This one had its sound chip go in three weeks, and the motherboard was replaced on warranty. Smooth as silk ever since.
After changing the HD twice and finally the motherboard, Microsoft did want to hear my voice before they validated my Windows 7 Ultimate that last time
because, by then, absolutely zero hardware correlated with ID's of what it was installed on.Windows 7 is happily managing two internal HD's, an external RAID for backup for each of them, and a third RAID that was a little flaky and got replaced, but still hangs on. I have a Linux machine and a laptop on a KVM switch.
My copy of Windows 7 Ultimate is from NewEgg, an OEM copy that comes with no free Microsoft support, as did Vista before it, XP before that, etc.