It is a great news that Paint.net 3.5 beta 1 released. You can obtain it here: Download Paint.NET for free.
What's Paint.NET. It's free image and photo editing software for Microsoft Windows.
Paint.NET Minimum System:
* Windows 7 (recommended),
or Windows XP SP2,
or Windows Vista,
or Windows Server (2003 SP1 or newer)
* .NET Framework 3.5 SP1
* 512 MB of RAM
* 1024 x 768 screen resolution
* 200+ MB hard drive space
* 64-bit mode requires a 64-bit CPU and a 64-bit edition of Windows.