http://www.eecs.wsu.edu/paint.net/download.html
Paint.net is free and good but alas on checking it needs
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System Requirements
Minimum System
Windows XP (SP1 or later), Windows 2000 (SP3 or later), Windows Server 2003, or Windows Vista
.NET Framework 2.0
400 MHz processor (Recommended: 800 MHz or faster)
128 MB RAM (Recommended: 512 MB or more)
1024 x 768 screen resolution
50+ MB hard drive space
64-bit support requires a 64-bit CPU that is running an x64 or Itanium edition of Windows XP or Windows Server 2003, and 256 MB RAM
Please note that Paint.NET uses your hard drive to store temporary files related to undo/redo. Because of this, actual disk space requirements will depend on the type of actions you perform on an image, and on the size of the image.
Download
If you would like to install Paint.NET, please use one of the download links below. We also provide installers that include the .NET Framework for your convenience: they will detect if .NET is installed, and if it's not then they will install it. We recommend downloading these if you do not already have .NET installed, if you are unsure if you have .NET installed, if you would like to share Paint.NET with a friend, if you would like to distribute Paint.NET on a CD or DVD, or if it's just plain more convenient.
Webmasters: DO NOT link to these files directly. Instead, provide a link to this download page. Otherwise our site gets flooded and download speeds drop to intolerable levels. Thank you.