Localmente, ya que estoy en la oficina, baje mi código y lo arreglé (cerré los dos div's que faltaban) y subí el archivo.html al validador y me sigue dando errores...
Cita: # Error Line 163, Column 6: end tag for "div" omitted, but OMITTAG NO was specified.
</body>
✉
You may have neglected to close an element, or perhaps you meant to "self-close" an element, that is, ending it with "/>" instead of ">".
# Info Line 44, Column 0: start tag was here.
<div id="contenedorgral">
# Error Line 163, Column 7: XML Parsing Error: Opening and ending tag mismatch: div line 44 and body.
</body>
✉
# Error Line 165, Column 7: XML Parsing Error: Opening and ending tag mismatch: body line 43 and html.
</html>
✉
# Error Line 165, Column 7: XML Parsing Error: Premature end of data in tag html line 2.
</html>
juro que esta vez si estoy más que perdido!