Original Sims2 cd`s not playing

[Homer1000]

I have just bought the game, installed it perfectly. But when I try to play, XP comes up with an error-message. The game doesn´t even load and I´m talking about the original cd´s, (no mods, cracks or no-cd`s).

I defraged my harddrive and shut all unnessesary processes down as I was told on WWW.sims2.ea.com.

Any quick solutions to my problem ?

I was told by a friend that I proberbly need to format my harddrive, but, hey I mean, my computer runs perfectly and normal.

Do I really need to format to play a game?

I exeed specifications, so that´s not the problem.

Please help

Homer