Am having the same decompressing error - on both full window and not. At the same place both times on load, verification happens and is ok each time I start the game. Am on Win 7 64, and am not sure what to do next... redownload and try again maybe (and that doesn't make me happy - this one took forever.)
A LOT of us are having this exact problem. Most of us are on 64-bit Win 7, but a few aren't. Anyway, might be better to keep the discussion to that multipage thread rather than creating multiple threads, so if someone gets an answer we all know.
I have the same problem. When the loading screen comes up the game crashes. All the files verified perfect. The game just wont load and sends the error report. Im running a Quad core AMD Phenom II x4 810 2.6Ghz with 8 GB RAM and a Gforce GTS 250 with 1GB RAM. Windows 64bit.