Inspiron 570, Reinstall disks?

This Inspiron 570 64 bit address has failed with C:\windows\system32\wow64.dll . As this supports 32 bit programs to run on 64 bit systems, I cannot run any programs. I would like to do a reinstall but because this is a factory installed system and no install disk is available I am seeking access to a reinstall disk. How and where can I locate such a disk?? I have been looking through Dell site with what appears to be a run around but no actual information as to how to obtain a reinstall disk.