Have you tried to install them with the Clean Installer?
http://sims2pack.modthesims2.com/Usually bypasses any default installer bugginess, and also lets you sort out things you don't want to install.
Can you play the game fine? Or are there troubles there, too?
(also remember to update hacks or mods you have to M&G or in certain cases AL/M&G - M&G is considered an EP by the game, so it's very important if you don't have AL. It won't do anything for installing and such, but if you do it before playing, you won't get in trouble afterward - it's just one of those easy to forget things when installing new expansion packs).