Lee - this won't help you all that much with your quest for PC info, but I'd shutdown Outlook and all the other stuff (including Startup programs) that you don't need to have running. Multiple cores aside, looks like your PC needs all the help it can get!
If you do a big job you must expect long run times. There is no silver bullet. Get used to it or buy better software.
I'm not familiar with Simulation (I mostly use ANSYS), so I would listen to the others a lot more than me. It doesn't look like you need more memory, as you aren't pegging your memory usage, but it could be that Simulation is limiting the amount of memory it uses to fit the amount available, so adding more memory could result in less disk access and faster run times. It does seem like you are getting a lot of disk and network access. Perhaps that is normal for Simulation but I would be suspicious.
I have had nonlinear problems that took about a week to run, so it could just be that you are stuck with long waits.