Thanks but it didn't help me. Uninstalled game, cleaned registry, edited autorun.inf with no result.

Ok. Post #11 helped. I did exactly what peterf1999 said with second image (named it "Mirror's Edge 2") But the most interesting thing is that my first image is named DVD1 and works perfectly. Strange indeed.
Thanks to peterf1999 for renaming .mst contents!
However I'd like to know what was wrong because it was the first (and I hope the last) time I had a problem like this.