It all started when I was editting an image and Paint.NET sent me a message that Beta 4.0 is out and that I should upate. But when I tried to install Beta 4.0 it said that this program is already installed (wait, what?!). I tried to uninstall Paint.NET and see can I install the new version. It couldn't uninstall because a program was missing. I have the MS .NET framework 4.0, 4.5 and even 4.5.1 so don't tell me to see do I have it installed. After that I deleted the Paint.NET folder and now it cannot install. I'm using Windows 7 Ultimate X64. Any help on this will be appreciated. Perhaps a fresh OS re-install will do the trick?