Impossible to import office (copy/paste) with style using IE7

I tried to use office import copy/paste WYSIWYG feature in a virtual environment using IE7 but it does not seems to work.

• create a new page using using top menu create page feature
• when in the WYSIWYG use import copy/paste feature
• copy paste a MS Word content to the Window
• click "import" -> nothing happen

Note that it works well when i write by hand some text or if i ask for an import without style but not if i do that after a failed import with style (i need to reload the page in edit and then ask again for the import popup).

There was no js error when looking with Firebug.