This sounds like an issue I've seen previsouly, whereby a Windows machine will get past the SEE PBA screen and start loading Windows, but then displays nothing but the blue Windows background and sticks at that point. Does this sound like your situation?
In my experience, this is usually down to a problem make/model, so if you could provide that information (along with the Windows SP level, any other encryption software that may also be present, etc) it would be useful.
Upgrading SEE to the latest version (8.2.0MP2) will help, as the various Maintenance Patches and updates may include a fix for you particular make/model. Plus in 8.2.0, Symantec introduced the "Hardware Configuration" bit, to try to address the various compatibility issues.