Hmm that is a lot of RAM so it should be okay. Also are you using the latest Construct Classic version R2 (download link in my forum signature), or the older R1.2?
And if you press Windows key (the Windows logo) + R you can bring up the "Run" box, then type: dxdiag
Running that program will show your complete PC specifications in the "System" and "Display" tabs.
That is a low number of sprites and they aren't too big, so it shouldn't be the problem.
Maybe you can also try updating your DirectX 9 drivers: http://www.microsoft.com/en-ca/download ... aspx?id=35
By scripts, are you using Python scripts?