CIV 4 Gold Istallation problem?

[Warrenglo03]

I installed gold (Civ4 + Warlords) and if I try to install another expansion like BTS, it says "civilization 4 not found". The game is there, I play it often. I tried to reinstall it but I have the same problem. Same with utility programs, they say they cannot find civ4. What could the problem be?

PS-The game wont install to my startup menu. I had to go to the file under 2Kgames/firaxis/civ4 to create a shortcut on my deesktop. Any suggestions?