you can puchase the screen on ebay and this video will help with replacing the digitizer
http://www.ebay.ca/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.XAsus+MeMO+Pad+7+ME170C+digitizer.TRS0&_nkw=Asus+MeMO+Pad+7+ME170C+digitizer&_sacat=0
https://www.youtube.com/watch?v=H48UAZmzEno
hope this helps