Custom EULA to pop on windows login

Seems simple enough. On windows login (xp sp3) Pop EULA application with EULA I supply. Accept = Allow access to windows Decline = Power down Possible need to know information: Working with Boot It Bare Metal, a program that creates an 'extended master boot record' that allows more then 4 primary windows partition on the drive. This program, as I have learned while working with it, stores it self on the first track of the hard drive. When using other programs, specifically ones with any type of copy protection using the common [login to view URL] and apps like "safedisk" can interfere in the first track and confuse the Boot It. However this shouldn't impact what we need to accomplish.