Your monitor (1024X600) ratio isn't 1:1 to original 1280x800.
Horizontal ratio = 1024/1280 = 0.8
Vertical ratio = 600/800 = 0.75
In your case, vertical fit is better but your horizontal will be left blank on both sides, 32 pixel each side ((1024 - 1280*0.75)/2 )
After import the file, go into each component and edit the X and Y position by multiply 0.75.
Don't forget to change background resolution too. Those 6 circle gauges probably need to resize too.