I'm having the same problem - I have Windows XP and can't run Vectorworks 2010 student version - when it's about to start up it says it has encountered a problem and has to close. I installed and reinstalled it and both older and newer versions of Quicktime many, many, many times, updated my video driver, installed all windows updates including .net framework and now just tried creating a new account - and I'm still getting the same error! What now?
ps- I notice in the user accounts there is a ASP.NET MACHINE A...which is a Limited Account and password protected. Could that have something to do with the problem?