That's right. As of Windows Vista the Microsoft OS is nothing but spyware loaded to the gills. If you want your operating system to be atomic, distinct and devoted just to functionality, you should avoid MS after Windows XP like the plague. Your OS needs to run on Linux, FreeBSD, DOS or Win32 pre-Vista.
Reason #1 I have targeted older legacy systems for deployment. The ultimate stripped down, bare-bones Windows OS out of the box is Windows NT Workstation, requiring just 16 MBs RAM out of the box and featuring all Windows services and basic utilities.