That's happened to me before!! All you have to do is restart your computer and it will do either:
a) spit out the disk, and you can put it back in and it should work.
b) recognize the disk.
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I bought my copy off steam so i don't have a disk but if you bought your copy from a store you might have to use the disk. If that's a problem for you i would recommend looking up and downloading a cracked exe from the pirate bay or the likes. Once you download this new exe go into the sims3 file on your computer and replace the old sims3.exe with the new one you just downloaded. Now you wont need the disk anymore.
In the Sims 3, your computer has to have a lot of space (GB), and it needs to have a new video card. I bought the Sims 3 when it came out, and my computer couldn't support it either. I suggest buying a newer computer, but when you do, ask a professional about the space, and about the video card.
No because sims 3 is very unharmful and wont hurt you PC at all when you you download
Your disc must be faulty or scratched.
* I think your computer has issues.