My dev machine installed Windows 7 security updates last night (KB2901118 and KB2898864). The next day I get an error when running our EPiServer 7.5 CMS site:

Unable to load one or more of the requested types. The following information may be a subset of the Type/LoaderException information present - inspect with debugger for complete view.
Check assemblies [EPiServer.Packaging, Version=3.0.1845.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7] and/or types [EPiServer.Packaging.Storage.IApiKeyStorage,
EPiServer.Packaging.CommandLine.InstallerApiKeyStorage,
EPiServer.Packaging.CommandLine.InstallerHostingEnvironment,
EPiServer.Packaging.CommandLine.InstallerLocalizationService,
EPiServer.Packaging.Notification.INotificationService,
EPiServer.Packaging.CommandLine.InstallerNotificationService,
EPiServer.Packaging.Storage.IPackageStateRepository,
EPiServer.Packaging.CommandLine.InstallerPackageStateRepository,
EPiServer.Packaging.CommandLine.PackagingHelper,
EPiServer.Packaging.Configuration.EPiServerPackagingSection,
EPiServer.Packaging.Configuration.IPackagingConfiguration,
EPiServer.Packaging.Configuration.PackageRepositoryCollection,
EPiServer.Packaging.Configuration.PackageRepositoryElement,
EPiServer.Packaging.Configuration.PackagingConfiguration,
EPiServer.Packaging.Constants,
EPiServer.Packaging.Exceptions.PackagingException,
EPiServer.Packaging.Exceptions.AlreadyInstalledException,
EPiServer.Packaging.Exceptions.DisabledPackageInvalidOperationException,
EPiServer.Packaging.Exceptions.ApiKeyRequestException,
EPiServer.Packaging.Exceptions.InvalidFileException]. Information from LoaderExceptions property [Could not load file or assembly 'EPiServer.Packaging.CmdAPI, Version=1.0.0.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7' or one of its dependencies. The system cannot find the file specified.].