I can't see any purple hue in that photo. (It actually seems to have a rather nice copper hue to it). Further, what can be seen of the Windows Explorer display behind it looks fairly close to normal to me.
The English language manual for your monitor is here:
http://www.viewsoniceurope.com/uk/assets/052/14929.pdf
You might need to use the 'Color Adjust' feature.
This test card might help you:
http://reeddesign.co.uk/testcard.htm
You should be aiming to get both 'true black' and 'true white' displayed, while being able to see all of the numbers (from 0 to 10) on both of the numbered lines.
Remember that what you see on the monitor depends upon the graphics output from the computer. If the PC only has 'on board' graphics there's probably little that you can do about it but if it has a separate video card there should be controls provided to adjust the output. Try right-clicking on your desktop and selecting Properties > Settings > Advanced to see if any appropriate options appear (such as a 'Color' tab).
Or perhaps you just need to take your sunglasses off?
;-)