Unfortunately I don’t know anything about asp. In the abstract, there should be no problem. You’ve got your asp pages up and running- you install EE, you make sure not to create any template groups that would conflict with existing folders.
In other words- just let them run side-by-side. I’d probably move the asp bits over at some point just to make things easier, but there’s no inherent conflict.
That said- those asp pages don’t remotely look like they’re parsing. Or… what have you. I think you’re going to need to talk to someone who’s at least familiar with asp. Once those pages are working, running EE along side it is no problem. But getting it worked is purely asp related. Which I wish I could help with, but I know less than nothing on that one.