Hi,
Here is a link to a video that shows how to replace the LCD screen and Digitizer (touchscreen) on your phone.
https://www.youtube.com/watch?v=Zp0JoXbp...
Here is a link to just one supplier of the part. It is not a recommendation to use them. It is shown to give an idea of the cost of the part. There are others online that may suit you better.
http://www.etradesupply.com/htc/windows-...
If you find the repair too daunting to do yourself then I recommend that you contact 3 reputable, professional mobile phone repair services and ask for a quote for a repair. I suggest 3, that way if all the repair estimates are close you will have a truer indication of the cost of the repair. You should already know the cost of the replacement part.
Hopefully this is of some help.
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