So as I'm going to be attempting this in the next few weeks it is interesting to note that this would appear to still be an issue with the RTM of 2008 as the Hyper-V is still in beta.
Another note mentioned that you don't actually reinstall:
You don't really need to reinstall anything. You only have to reset System & Default User regional settings to original (default EN-US) settings and then reboot the server.
Still, worth keeping mind if you are after the Hyper-V service? ;-)
Please refer to Ben Armstrong's post here:
- You need to install using 'English (United States)'. If you install with any other language (or flavor of English) Hyper-V will not work. However - you can change the local / keyboard preferences for your user after installation without any problems.
Hyper-V on Win2008 RTM - VMM service fails to start?