I have had good success with Win32::Gui

Win32::GUI is a Win32-platform native graphical user interface toolkit for perl. basically, it's an XS implementation of most of the functions found in user32.dll and gdi32.dll, with an object oriented perl interface and an event-based dialog model that mimic the functionality of visual basic.

The stablility of this module is quite good, considering stability in a win32 environment is an oxymoron.