There should be a space between ooffice and -writer. If that doesn't work, just
right click in one of your menus, select edit menus, navigate to the open office
writer menu item. Highlight that menu option. Now click properties or edit,
depending on your version. Write down what it says in the "command" box and use
that to launch the program. Hopefully that will work for you.

But you still may want to reconsider reinstalling oofice from the
repositories...