What video card do you have? I use an intel i5-2500k which has integrated video chipset intel HD 3000, windows 7 64. My problem is kind of similar to yours and couldn't find a solution. It is strange and frustrating since my system can play much more demanding games: Battlefield 1942, Battlefield 2, Elements of War, Mount&Blade.
The problem in RON: tooltip boxes are displayed only if they overlap with buildings, forests or mountains, otherwise they are invisible. So it's like clicking blindly on buttons without knowing what they do (or the requirements for upgrades, etc).
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Update:
Hey guys, I've found a solution: a program called SwiftShader which emulates a video card.
It introduces a few bugs like some textures are flickering, but tooltip boxes are finally visible and this is more important.[This message has been edited by atreyyu (edited 08-21-2011 @ 10:57 AM).]