Windows may show an error message in the form of code 39. This happens when there is a failure to install or re-install the drives, due to the issue of a corrupted or a missing drive. This operating system concern of code 39 arises due to registry issues. A back up of the same is the first step to deal with the Windows problem. Through the Run command and 'regedit', the corrupted or the missing driver issue can be solved. Once the computer is restarted, the changed configurations will be saved.