Some queries about Civilization V

[theprof00]

I have the acer aspire 6930G
CPU: 2.0-GHz Intel Core 2 Duo T5800
RAM/Expandable to: 4GB/8GB
Hard Drive Size/Speed: 320GB/5,400 rpm
Display Size/Resolution: 16 inches/1366 x 768

I can run civ 4 and colonization. But both are quite slow.