Sims - LL (German Version) Installation Error

[BLT]

During the installation of Sims-LL an error occures, I can´t deal with! Description: seems to be kind of dll-error ("dll functioncall crashed: isrtp32.ISRTPatch32"). But there´s no such dll on the cd, so that I can´t check it.
It´s an burned cd, could that be the reason? If so, I need a hint how to make a copy of my original without loosing any datas. Or could there be a problem with an installed patch?
Dudes, I count on you!