Trouble running software update - updates could not be saved / verified

None of the selected updates could be saved.

The update could not be verified. It may have been corrupted during downloading. The update will be downloaded and checked again the next time that Software Update runs.

Updates include:

Security Update 2012-001

Java for Mac OSX 10.6 Update 15

Apple Software Installer

iTunes 11.0.2

Safari 5.1.9

Any advice on how to solve this?