Some archives include a "recovery record." If your file is corrupted, you can try opening the archive in WinRAR and clicking the button. It may be able to rebuild the damaged data in part2 without requiring a fresh download.
: You cannot extract part2 by itself. You must have part1.rar , part2.rar , part3.rar , and so on, all saved in the same folder . sc23996-NFSRM11.part2.rar
: If sc23996-NFSRM11.part2.rar is significantly smaller than the other parts (and it isn't the very last part), it likely didn't download completely. Try redownloading that specific segment. Some archives include a "recovery record