Heroes 6 - Discussion

Installed Heroes 6. My first impression is negative!! Where are the beautiful cities that were in Heroes 5?? And the aerial view of the city?? There's no spellbook like in the previous games!!! Besides all that, the game constantly lags and freezes for no reason!! All patches are installed. Does Heroes 6 really require such a powerful computer (I have an AMD Athlon X2 6000+ processor, 1 GB of RAM, and an ATI Radeon HD 2600 XT graphics card)!!!!
I've reinstalled the game, but it still freezes completely. Can anyone help me, what can I do!!!