Desmond said:
If I type the apostrophe (') or the double quotation mark
(") before a vowel, the vowel (a,e,i,o,u,y) appears with an
accent over it.
Your keyboard layout is using the "US - International" layout which does
these 'dead key' effects for accents.
Go to Control Panel - Regional And Language Options. Take the Language
page and click Details.
There if you see United States - International under Keyboard for
English in the lower pane and no other layout, click on Add and search
for a different one, as appropriate (probably simple US) in the lower
drop down,
Then in the parent page, select this desired combination in the Default
Input language in the top drop down, Apply, OK and Apply any time it is
available on the way as you OK out. Then close and restart to bring it
into use.