Try going to File>Options>Advanced> General and unchecking the 'Allow opening a document in Draft View' option.
Beyond that, there are two possibilties that come to mind:
• a corrupt buildingblocks.dotx file; or
• a corrupt data key.
For the building blocks possibility, see:
http://support.microsoft.com/kb/555843
For the data key possibility (and others), see:
http://support.microsoft.com/kb/822005 (and, perhaps,
http://support.microsoft.com/kb/921541)
Note: Neither of these has anything to do with the zoom level in draft view.