Rico Try the following Possibility: Windows Update agent file Wups2.dll is registered incorrectly and registry files that relate to the Wups2.dll file are missing. Method 1: Register the Windows Update files 1.

How do you fix the code 646? Possibility: Windows Update agent file Wups2.dll is registered incorrectly and registry files that relate to the Wups2.dll file are missing

They’re stored in WINDOWSSoftware DistributionDownload To remove them: Vista ( commands can be run from Run on the Start Menu. If Run is not listed, click the Start orb; type run into the Start Search field; under Programs, click Run) 1. Stop the Windows Update service [net stop wuauserv – then click OK or