Pam, thank you again for answering and for offering help. I haven't done anything so far that isn't in the above posts. In a nutshell:
1) Since I never found the code for the original game, I purchased a new game (Deluxe version, including Ambitions).
2) Using the Uninstall function attached to the game, I uninstalled the old copy. That worked as far as I could tell.
3) Using the Uninstall function attached to the EADM, I attempted to uninstall but it didn't go well.
4) Uninstalled EADM via Add/Remove Programs in my Control Panel. That worked as far as I could tell.
5) Installed new Sims 3, entering new code when prompted. A Sims 3 icon was placed on my desktop.
6) Installed Ambitions, entering new code when prompted. An Ambitions icon was placed on my desktop.
7) Being unsure which icon to choose to start a new game, I clicked the Ambitions icon.
8 ) Launcher launched, I pressed the Start Arrow and was prompted to do updates.
9) Updates started but then Blue Screen'd.
10) Hard shutdown, reboot, try again, this time using the Sims 3 icon. No Blue Screen but it didn't start (I don't remember the message).
11) Decided to give up. Assuming uninstall should be done in reverse order, uninstalled Ambitions using the Uninstall function attached to the game. No problems that I was aware of.
12) Attempted to uninstall TS3 using the Uninstall function, but it got hung halfway through.
13) Attempted to uninstall TS3 using Add/Remove Programs, but it still got hung in the same place.
Side note: Before starting anything, I "copied" (not "cut") my saved games to an external drive. I suppose that means the old saves are still floating around on my PC somewhere. Do you think they could be adding to the problem? Should I locate and delete them?
That's pretty much everything. As I said, I tried to launch the game from the Sims 3 icon but got an error message after the Launcher. Error Message: "Service Initialization Error (0x039e8474)".
I have printed out the instructions you provided but haven't acted on them because I'm not sure what to do with the backup registry file that will be created. I've been reading and researching here and on the official site, but I haven't seen anything that tells me what to do with the backup file or with the file I'll be deleting items from once I'm done editing it. I'm reluctant to touch anything until I know how to finish up.
I hope that helps you help me. I'm starting to get jittery from being Simless
.
current moodlet(s): Hopeful