hey, what i am proposing isnt specific to your problem but could help.
You will need to remove all of the sims 2 files. First of all do this to both drives in turn:
Start > my computer > one of the two drives > program files > EA games > right click on sims 2 and delete. If you have an Electronic Arts folder or anything like that go into to them and delete the sims 2 files as well. Doing this will remove all of the game files. Then go into the recycle bin and press Ctrl + A > delete
After doing this on both drives you have to delete the registry.
start > run > type regedit then go > before doing anything click file > export > name the file Backup , make sure the Export Range is set to All and then save.
Next: expand HKEY_LOCAL_MACHINE > expand software > expand EA games > right click the Sims 2 folder then delete. Then go back to software > Electronic Arts > right click Sims 2 folder then delete. Then close WindowsRegistry editor.
This will have removed practically all of the Sims 2 files. Try installing it once again afterwards. Hope this helps :up: