To change the screen size to 1024 x 768
1)  Right-click on an empty desktop area

2)  Select "Properties"

3)  Select "Settings"

4)  Change screen area to 1024 by 768 pixels

5)  Click OK
This will only take a few seconds If you have a 17" screen or bigger it is recommended that you keep your resolution at 1024x768. The only exception would be if you have a low spec computer, eg. a non Pentium or one without a separate dedicated graphics card in which case it may be deliberately set at 800x600 or less. Anyway, have a try!
Alternatively, if your browser has a zoom feature then use that to reduce the screen area so as to get the full page without the need to scroll left and right.