Hi, It's me Mgamerz again. I had to make a second account because I just reset my password and one of the mail controllers for my agency has locked me out and nobody knows why so I couldn't log in. I didn't want you to think this issue was resolved or that I am not courteous enough to give a response.
We built a package from RU1 and deployed it on other Windows 7 x86 computers with SEP11 existing on them.
They used Proactive Thread Protection, Network Threat Protection and AntiVirus/AntiSpyware.
However, they still bluescreened. We ourselves do not have a support contract with Symantec, but our help desk does. We got a copy of CleanWipe through them (Why do you make CleanWipe only available through 'support'? It's a real hassle and makes us really think less of Symantec when we have to contact you to fix problems in your own software when your own tools to fix issues could be easily and readily available).
After using CleanWipe it installed fine. Before I used CleanWipe, I tried the Windows Install and Uninstall Troubleshooter to foribly remove SEP11 since there is no easy way to uninstall it (Manually doing 76 steps is not going to cut it): http://support.microsoft.com/kb/2438651/
This was after I booted into Safe Mode, ran msconfig, disabled all Symantec Services and rebooted into normal mode. It booted fine with no BSOD's, but the tool showed that there were two installations of Symantec Endpoint (It did not have version numbers). I am thinking that it does not uninstall and reinstall complete and then breaks. After it breaks, the installer never works because it cannot find the file specified when you run the SEP12 installer. This has been a real nightmare to upgrade all of these machines.
I have two complete memory dumps (from different computers) and might open a support case with Symantec to see if they can figure this out so that others don't have to deal with it.