Performance issues with Extend Edition

[GHOUL]

Horrible FPS with RoN:EE ! The classic version runs fine, and so does modern games such as Civ IV, GTA V, R6 Seige...

Game does not go above 26 FPS when paused, stays at 12 or goes under otherwise. Land only Arena 1v1 map size or Huge 8 players doesn't matter! All graphic settings and resolution, AA and Vsync max/on or min/off DOESN'T MATTER. What is up with this? Does anyone have any idea, I have tried a few things nothing seems to work! Classic version has strange graphic issues on my machine. Here are my PC specs from "System Requirements Lab .com"

1. Win 8
   
2. CPU Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
   
3. CPU Speed 3.4 GHz Performance Rated at: 8.5 GHz (I don't know what this means??)
   
4. 8.0 GB Ram
   
5. GPU GeForce GTX 645

Any help much appreciated!

[Fedomar]

I got a constant FPS of 60, but i doubt 26 will make any difference to this game to be honest.
it's not a shooter orso.

- You sure you have 'modern' (not even needed to have the latest) drivers for your graphicscard?
- You sure taht the directX version and Microsoft Visual C++ installed correctedly while you installed the game?
...\Steam\steamapps\common\Rise of Nations\_CommonRedist\DirectX\Jun2010\DXSETUP
...\Steam\steamapps\common\Rise of Nations\_CommonRedist\vcredist\2012

[GHOUL]

Using the installers you listed, the game now stays around 25 fps even when unpaused. Yes this is a playable fps but 5 is not. I assumed verifying game cache integrity would have checked for those things, but it seems not. Thanks for the help!