[horrible windows]

...all the windows are maximum...

The following, linked topic will be of immense use to you; as you will see, we've seen and dealt with this before: viewtopic.php?f=10&t=25244.

That should detail the technical issue and solution.

thank you so much , i'll try it.

[horrible windows]

First of all, the Bugs & Troubleshooting section would be the place for this... :wink:

I have never seen such a thing. And I, from my limited tech knowledge, cannot imagine it comes from Paint.NET.

There is, maybe, a bug in your .NET-Framework or your entire system.

As a quick solution, you could uninstall Paint.NET (from the Control Panel), restart your PC and then try installing it again.

I refer to Paint.NET, NOT to the .NET-Framework.

Regarding the Framework, you should make sure you've installed all updates, especially the Service Packs. For .NET 2 (which is required for Paint.NET) the current SP is SP2.

thanks, I did this several times, but the problem still there

[horrible windows]

when I open the Paint.net application, all the windows are maximum like the attachment. anything wrong with my system or the paint.net application??