I'm not sure why the Cake Mania: Main Street won't run well.
Its system requirements don't seem very high.
You could try uninstalling and reinstalling, if you haven't already.
If you have an antivirus, you might want to make sure the antivirus isn't scanning the game as it tries to run. Maybe you can enter an exception for the game exe in the antivirus scan list (depends on your antivirus).
You might also try changing compatibility mode on the game's .exe file to XP compatibility.
If the game from Wild Tangent is slow or freezes, check that it isn't an online game that depends on the speed of your internet connection. The place where you got your computer fixed might have a faster internet connection than you do.