When I am writing in either Outlook or Wordpad and use the " or ' key then
the next letter I type is sometimes altered.  For example if I type "
followed by the letter t then it appears normally, example - "t.  But if the
next key I press is either e,i,y,u,o or a then it alters the letter example -
ë, ï, ÿ, ú, ó and á.  The first three were done using the " mark then the
letter.  The last three were done using ' then the letter.  I assume it is
somehow associated with typing  in another language, maybe Greek but I
certainly don't want it and don't need it.  I did have activated another
keyboard language, Cyrillic, but I have disabled that but my problem remains.