"Unable to start game". [SOLVED]

parker_roo wrote:Alright, I hope I can get this fixed without having to uninstall and reinstall my game and EPs.  First of all, when I try to play the game, a prompt says, "Unable to start game, Your The Sims 3 Base Game is incompatible with the current Sims 3 Expansion Pack.  Please update your game via the game launcher."  Okay, I need to update my game, when I try to open the launcher I get this prompt, "Unable to start.  Please reinstall the base game."  So I successfully installed The Sims 3 and EPs following the "*MUST READ* How to install The Sims 3 correctly" thread.  I installed the base game and all of the expansion packs except for, Katy Perry Sweet Treats, 70s, 80s, & 90s Stuff, and Movie Stuff.  I got an update error on step 2, so I did step 2 first, then did step 1.  I updated the game to 1.67, and applied the Ultimate Fix. (Step 3) And I followed all of the Ultimate Fix instructions and did step 4.  After I applied the Cracks, I opened the launcher and it did not need to be updated.  I was able to play the game for two days, I then got all of these prompts for the game not being able to open.  I did not change any file on my computer, except for Windows 7 updated.  Would that be the problem?  Did the Windows 7 update change something dealing with Sims 3?  Oh and I did install The Sims 3 and EPs on my 500 GB external hard drive, but like I said, the game worked for two days, then the problem happened.  I have searched for hours on other threads on this website and on the internet, nothing is working.  Please help!  And thank you Games 4 the World for providing all of the downloads, fixes, and instructions!  Also thank you in advanced for helping me with these errors!