the second cd of the GOTY version does not work my drive tells me to put a cd in but the cd IS ALREADY IN!

i checked 1000 topics with that question already and no one has a solution so can please someone tell me if and where i can download the addons with my serial key?
please answer im going crazy here!

why are they even selling cds that dont work and have no solution for it???

Try booting your computer in safe mode and installing the disc that way. Apparently that's all that necessary sometimes. If you had really searched 1000 topics you'd probably have come across that one by now. It's also suggested in the Troubleshooting Tips thread that you should turn auto-play off on your system and install by opening the disc and selecting Setup.exe. There's two possible solutions right there, so I'm not sure what it is you're ranting about.