We have seen this problem only once since the release of Win7/Win8… It’s not a Rhino problem but more of an OS and account problem. Since we were unable to duplicate the situation there was really no way for us to get a good handle on why logging into the admin account failed to load the hardware video drivers…which prevents programs like Rhino from using any kind of hardware acceleration whatsoever. Other accounts worked just fine, it was only the Admin account, and only the “initial” admin account. The solution I came up with for that user was to create a brand new Admin account, make sure everything works for that account and then delete the old admin account… Again, we are not sure what is going on here with the OS, only that new accounts seem to work and that the problem only occurred with the initial admin account that got created during the installation of the OS.
Please let me know if this does or does not work.