To uninstall the mod you could just delete the Imperial_Civil_War folder. But as an idea to fix it, when you go inside of the Imperial Civil War folder does it look something like this
C:\Program Files (x86)\LucasArts\Star Wars Empire at War Forces of Corruption\Mods\Imperial_Civil_War
The error message you posted makes me think you might've installed it in the EaW folder that doesn't contain the Swfoc.exe. I have a rather old physical copy of the Gold Edition, complete with dust and all, which gave me 2 separate folders when I installed it (EaW and FoC) so I'm not sure how your folder is set up since you say your variant is named
Empire At War Gold.