Thanks Ritaoja2, on a serious note, I noticed when the game crashes, I get the "mech.exe" error message. This occurs in all game modes ( mega campaign, campaign, scenarios)
I run the game on an old Dell, twin-core,integrated video card, but most telling, it started 4 days ago out of the blue, when Win 10 locked up ( again)
Any advice appreciated on dealing with mech.exe error.
BTW, I tried de-installing and re-install...no go.
Windows 10 locking up might be telling that there is a problem in the computer. Perhaps a driver issue or more worryingly a failing component.
I do not know of any generic fix for a mech.exe error. But one easy test you could try is to rename the "SND" -folder in the game directory to something else. ("SND_off" for example.) This should disable the sounds for the game. You can also try to disable all the sounds from the Preferences screen.
If the game then runs without a crash with sounds disabled then it would point to a problem with the sound drivers or audio codecs.