Hello. Due to a recent fatal hardware failure, i had to replace my old WinXP 32 bit machine by a new 64 bit PC running Win7. Knigs bounty was running perfectly on my old PC but not on the new one.
The interface (main menu and in-game buttons area) flickers for several minutes after i start the game before stabilizing. If for any reason i move out of the game (either i alt-tab or i accidentally click on a hidden message from my media player ) it will flicker again when i come back.
The game is also slower and animations are not smooth, even though i reduced the textures resolution and disabled antialiasing. This makes evading monsters more tricky.
Finally, if i try to change some Graphic settings or quit the game with alt-F4, the game will hang indefinitely and i have to kill it with Task Manager.

I've read some other Win7 issues here. I've seen suggestions like installing DirectX9 but when i try the installer tells me i already have a newer version (sure i have DX11). I also read posts telling to disable ATI catalyst but i don't have any ATI control panel (my graphic cart is an ATI).

Any idea?

I don't have Win7 so I haven't experienced your problem but did some search and lot of people suggests installation of older version of catalysts. If you do not have control panel I would suggest that also.

I know the OP has probably moved on but for future reference...

Going into the options screen and hovering the mouse over one of the options to make the tooltip appear makes the flickering stop. You may have to keep the tooltip showing for a few seconds for the flickering to stop but strangely it does.