8% problem

Hello,
I have a big problem with my sims 2 i have had it on my computer before but i then deleted it to put on the the sims 3 and now i want it back on
I have tryed 4 time's now and it stops at 8% but then a liitle box come's up and it give's me two options of cancel or retrying when i click retry it goes up about 4% and i have been sat at my computer for about 4 hours now and it is only on 23% i need help whats wrong i have cleaned the disc and there arnt stractes that i can see can you please help
thank you