Hello Arjuna_M, welcome.
The best method to achieving a pure grayscale interface would be to control it on the monitor itself. Most LCD screens give you the ability to turn down what is known as 'Color Saturation'. In doing this, it gives a complete grayscale affect.
LCD menu controls are not all alike so if you are unable to figure out how to access your monitor settings, you may need to refer to your manufacturer's website for instructions.
In the event that you do not have an LCD screen, you may be able to try the following:
- Click START
- Click 'Control Panel'
- Doube click 'Personilization'
- Click 'Window Color & Appearance'
From there you could switch it to a number of high-contrast themes and click 'Apply' to take affect.
Let us know if this helps,
Thanks!