I think most would agree that upgrading to a newer version of AC has to be first on your list. AC 6,xxx still runs on my Windows XP workstation with 1gb ram. Still is much faster than Vicki's I pmed her and I think I have her convinced to take workstation out of loop and install her current AC, upgrade to current version and see if her last many months of misery were for naught. AC really does not need high horsepower machines to run.
Almost all large software companies or small for that matter, will recommend upgrading to the latest version BEFORE they do anything else. Especially when there are over 10,000 posts on this matter including from the big man himself.