I recently started having the same problems with Word 2007:

-Click to open a Word document and an empty word screen is displayed.
-File-Open a Word document and it is displayed but is not editable
-Close document "Word has stopped working" error occurs
-Cannot scroll with mouse, only with arrow keys on document

My problems also began immediately after Windows Update. After the auto restart I could not modify the open document. My Excel appears to be working fine also. I have uninstalled and reinstalled Office, but no luck.

Any ideas?