CRC problem but SFV checks out fine

Was given some files that I needed to compile, all rar files (r00, r01, r02…rar). Also provided par files and sfv file. When I run the par file, it says nothing needs to be fixed. So, I try extracting the files using 7-zip. It gets almost done and gives the message about the CRC failing (or corrupt, or something-or-other). When I run the sfv file through a checker, everything matches up. So what can I do - par files say no errors and the sfv file says everything matches, yet 7-zip gives me the CRC error (which prevents me from burning the files to a disc).