How about
Sims 2 Pack Clean Installer? It`s very popular and I think it`s great.
If you open your downloads folder in it, you`ll see a list of your downloads. delete all empty packages and duplicates, that highlight in pink. As for the hacks, they`re highlighted in red, but I would`nt delete them all, only those that you are not aware of installing.
If it doesn`t help, move your hacks out of the downloads folder to check if the problem could be caused by a hack conflict.