Expansion Pack Installation Problem I have gotten the Sims 2 to install successfully, but whenever I try to install a Expansion Pack it tells me that i need to ensure that my existing installation is up to date, and that I need to insert Sims 2 Disc 4. I have already installed all of my expansion packs before, but I had uninstalled them when I wasn't playing it much and now I can't get the expansion packs to install. I put in Sims 2 Disc 4 in the CD drive, and after I press the OK button it says that "The Update Process did not complete successfully. Installation will now terminate." Like I have said I have already had it installed onto my computer at one point but it won't install now. I am really hoping someone can help me, because I just got Open for Business and am wanting to get installed with the rest of my expansion packs.