Each time I try to update I get a error message when trying to install - Module 8920, Error 204
Please follow the steps suggested in this KB Article - Note theon top of the steps.
I hope it helps.
Keep us posted
EDIT: Before starting to follow the suggestions in the KB Article, please check the data and time settings of your PC and make sure that they are the current ones: this might look as a simple thing but it matters for virus definitions to be updated.