EQ2Interface - Error Updating: Configuration system failed to initialize

I had a power outage on my machine and ever since I've been getting the following error:

Code:

Error Opening Database File: System.Configuration

  at System.Configuration.ConfigurationManager.RefreshSection(String sectionName)

  at System.Configuration.ClientSettingsStore.ReadSettings(String sectionName, Boolean isUserScoped)

  at System.Configuration.LocalFileSettingsProvider.GetPropertyValues(SettingsContext context, SettingsPropertyCollection properties)

  at System.Configuration.SettingsBase.GetPropertiesFromProvider(SettingsProvider provider)

  at System.Configuration.SettingsBase.GetPropertyValueByName(String propertyName)

  at System.Configuration.SettingsBase.get_Item(String propertyName)

  at System.Configuration.ApplicationSettingsBase.GetPropertyValue(String propertyName)

  at System.Configuration.ApplicationSettingsBase.get_Item(String propertyName)

  at EQ2MAPUpdater.My.MySettings.get_MAPFilesURL()

  at EQ2MAPUpdater.MainWindow.DownloadUpdates()Configuration system failed to initialize

I've tried re-installing and un-installing several times.
I also tried copying the xml config file posted in another thread.

I'm on 64bit windows 7 (admin privileges are set).
This used to work, so I'm at a loss as to what it's complaining about.