Are you thinking to convert your non-touch monitor or screen into touchscreen?
There is good option available for you now. That is TouchGENiE. It is an innovative product that can change your style of using computers. It is touchscreen overlay for monitors. It is compatible with Wnidows XP, Vista, 7 or 8 computers, along with MAC, Android & Lynux OS. TouchGENiE is available in different sizes that fits on top of any existing monitor. Velcro straps or removable adhesives are supplied to fix the it above monitor. To use TouchGENiE attach the overlay screen above your monitor and connect it through a USB Cable.
GET THIS PRODUCT FROM AMAZON(Links Given Below)
Touch Genie Touchscreen Overlay Brushed Aluminium Frame for 19-Inch Monitor