incoming mail in outlook express shows formatting and contents garbled

[Nero]

On HP laptop.  OE recently started receiving mail as above, like this:

9j/4AAQSkZJRgABAQEAYABgAAD/2wBDAAoHBwgHBgoICAgLCgoLDhgQDg0NDh0VFhEYIx8lJCIf
IiEmKzcvJik0KSEiMEExNDk7Pj4+JS5ESUM8SDc9Pjv

or this

------=_NextPart_000_007D_01C9D97C.C799B040--

or this

   </STRONG></SPAN></TD>
    <TD width=3D351>&nbsp;</TD></TR></TBODY></TABLE>
<TABLE border=3D0 cellSpacing=3D0 cellPadding=3D1 width=3D540>
  <TBODY>
  <TR>
    <TD height=3D1></TD></TR></TBODY></TABLE>
<TABLE id=3DCart class=3D"regularCopy bodyAllBorder" border=3D0 =

can you help?
thanks,
Nero