In order to adequately evaluate Windows 7 [Enterprise; (is this the same as the "for IT Professionals" option?)] I need to be able to logon using diagnistic startup options, which are not allowing logon. My system boots-up up to the logon options (with both/either the Ctrl+Alt+Delete, or user display windows) and restarts within two seconds. I cannot adequately evaluate the product, so you "tech professionals" who actually earn your money from Microsoft Corporation may want to help this evaluation process, designed to encourage my purchasing of this, and other or your (company's) products. Thanks.