Error message 'installer integrity check failed' upon installing gpg4win file?

I am trying to install gpg4win onto xp. When clicking on the downloaded icon it comes up with the error message -

‘NSIS Error, Installer integrity has failed. Common causes include incomplete download and damaged media. Contact the installers author to obtain a new copy.’

I have tried to re-download multiple times with no luck. I have also tried downloading a range of pgp generators but windows would not let me run any of these either.

Any ideas would be much appreciated…?