Hypothetically: I'm about at my wits end. I have a USB boot setup for installs. I have 2 systems. System A's motherboard is a GA-EP45-UD3P running stock F10 firmware. It has an Intel Core 2 Duo E8400 Wolfdale 3.0GHz LGA 775 65W Dual-Core Processor. System B's motherboard is a GA-MA790X-UD4P running stock F9 firmware and using an AMD Phenom II X4 920 2.8GHz Socket AM2+ 125W Quad-Core Processor. When I install Windows 7 on system A the install proceeds rather quickly, the license terms come up for Windows 7 Ultimate and completing the install does indeed install Ultimate. When I install Windows 7 on system B however the install proceeds very very slowly, the license terms eventually come up for Windows 7 Enterprise and completing the install results in an Enterprise install. Both systems are using Western Digital Caviar Black 1.5TB HDDs I did initially install a copy of Enterprise onto system B (different source than the current installer) but decided to go with Ultimate instead. I formatted System B's HDD from Vista and then reran the install but the installer keeps wanting to install Enterprise. Any idea what is going on? Why would the same installer install Ultimate by default on one system and Enterprise on another? The installer does not give me the option to make a version choice.