GIMP cannot open png files due incompatibility

Hello,
Can anyone tell me please how to set up my GIMP to accept a .png format in Windows ? I tried everything I know to make the proper settings and I did some searches on the Internet and nothing seems like to work. Can anyone help me please to fix this error ? How can I solve this one ?
Regards experts !

GIMP Message
Saving ‘C:Documents and SettingsArthurDesktopuntitled 10.png’ failed:
Error while saving ‘C:Documents and SettingsArthurDesktopuntitled 10.png’ could not save image.
