Sure, why not? It's not going to be super-exciting, but at least for simple stuff this will do.
That system is kind of puny. The minimum recommended ram is 8 GB. Because of the specs I suspect that your screen resolution may not meet the minimum system requirements. I strongly suggest you read them before you purchase AE.
Thus, It is not OK?
It depends on your definition of ok.
Also, does your screen resolution match the minimum requirements?