I can hopefully help to resolve the flicker menu issue.
The flickering is generally caused by hardware acceleration available on recent video card.

To solve the issue right-click on the windows background:
- select "Properties" to show the dialogue box "Display Properties."
- select "Settings" tab and then click on "Advanced" button; this bring up another dialogue box.
- select "Troubleshoot" tab and slide the slider next to "Hardware acceleration" to None.

Hopefully this piece of advice will resolve the woes which beset me when I recently purchase
Shogun Total War - Gold Edition.

gannbatte-ne (good luck),

Omi-san.