If you downloaded this file and verified it is complete and compatible with your version of Windows, delete the file and try downloading and running it again. It's possible during the download that the file became corrupted.
Finally, if the second download does not work, try downloading the file from a different webpage. It is possible that the person or company maintaining the website mistakenly uploaded a corrupt version of the file you're attempting download.
Installing a program from a CD or other disk
If you're attempting to install a program and are getting this error, verify that the CD is clean. If the CD is dirty or bad, you could get this error during the install or after the program has been installed because it was not copied properly onto the computer.