The development team is working on an series of updates for the launcher. We've been using .NET 2.0 for a while since it seems like most people have that version (and it comes with Windows 7). .NET 2.0 has some issues that come up when .NET 3.x is installed and then various service packs are installed. A reinstall of .NET solves the issue, but that's small consolation for someone who is having trouble with the launcher.
The development asked me to reach out the community and see what players would think about us upgrading the launcher to .NET 3.5.