Keep the eastern block going and you will definitely see a different architecture (and likely a parallel internet....) there.
Some butterflies in Britain and perhaps RISCOS/ARC could continue to do well in desktops. Or AmigaOS.
In Japan/China if the problem of language support could be cracked earlier, by native companies (they will have more of an interest in that) you could very easily see different systems arrise there. Even today with standard Microsoft OS they tend to design things according to very differnet norms.
That sounds interesting!
Especially if with Japan it becomes even more exotic for "westerners" to attempt to access the very distinctive Japanese culture on Japan's internet equivalent.
A British operating system would take hold nicely in British commonwealth countries, not to mention with British expatriate communities and/or countries that are not necessarily English-speaking but nonetheless at least culturally Anglophile... The British system could end up centered in Britain and reaching to the other side of the globe with Singapore, Hong Kong, India, Australia, New Zealand, and, hmm, maybe Canada somehow gets a bit "nationalistic" and joins this affiliation as well?
(When HK returns to China, HK will still have a substantial number of computer-owners not about to let go of their British OS, and there could be some potential friction.)
Canada could be a fun place for Americans to go and get British-OS computers to try and connect with the British internet equivalent.
Canada could end up with at least three different operating systems: The British one, the American OS (proximity, economic and social interest), and a Quebecois OS affiliated with France's OS.
Israel would be an interesting place, probably with afficionadoes of American systems (both Microsoft and Apple; who else but America would have two computer operating systems?) and British as well as perhaps their own indigenous Hebrew-language OS aimed at education on one level and at security with affiliated research and development at another.
Edit: Persia-Wank! Iranian programmers and software/hardware developers start up a Farsi operating system, and, with the patriotic government pushing the OS through schools at all levels, hey presto, Iran gets computerized on a deeper and wider level... High-tech Iran, etc.