I am running Windows Vista SP2 and have downloaded every single update that isn't a language pack or game.
I have manually gone through all of my services (in services.msc) to reflect a brand-spanking-new Vista SP2 install. The one exception is Windows Defender, but this is because I have Microsoft Security Essentials running which automatically and completely disables Windows Defender -- the service cannot even be started while MSE is running/working.
I am running on Administrator.
I have tried to install to both Program Files (x86) and to Desktop.
I have deleted and redownloaded the Battle.net folder in C:\ProgramData many times.
I have checked for potential compatibility settings in properties on every single executable related to the install and none are set in compatibility settings.
Anyone have a solution?