Help With Installing Expansion Packs with the Sims Deluxe

[MiLkWeEd]

I installed House Party earlier and it worked fine. Then when i close the file and tried to open it again it told me to uninstall. SO I did and now I cant install house party!! Can anyone tell me the steps to install expansion packs in the Sims deluxe? I even erased everything did the same steps but everytime i try to play it tells me this "It has come to our attention that you have installed another Sims expansion pack after the sims deluxe edition. For this to work propertly The Sims deluxe installer will now update your installation! Help