Right-click a blank part of the desktop and select Properties then Settings.
Move the screen area slider one or two notches to the right and press Enter.

You should not resize images to view them.  You should use a viewer that
allows you to zoom images as required (leaving the original untouched) such
as
www.irfanview.com

Hi,

I'm no expert (just came on to ask a Q myself) but try
right clicking anywhere on your desktop choose properties
or display properties. You should go to a screen with
tabs at the top that say "themes" "desk top" "screen
saver" "appearance" "settings".

Click the settings tab and there should be a "display"
area with a drop down box or a thing that looks like an
arrow you can move along with something like 450 x 600
above it. Move this arrow or use the drop down box to
change the setting to a higher display setting.
The "apply" button should become available. Click the
apply button and it should change the images you can
still see on the screen behind the panel your working in.
Move the arrow to different settings until you find the
one you want clicking apply (not OK) each time to preview
it. Here you can also change the colour quality in a
similar way clicking apply to see what difference it
makes. Once you're happy with the settings click OK and
you should be sorted.

If it doesn't work - sorry that's my best shot.
If it does - chocolate chip please!

Michael