When you click in a form of an interactive PDF, you may experience the following error if you're using the latest version of Adobe Reader on a touch device running Windows 8:
"C:\ Program Files\Common Files\Microsoft shared\ink\TabTip.exe
Windows cannot access the specified device path or file. You may not have the appropriate permission to access this form."
In order to resolve the issue, you must either disable Touch Mode or install a patch directly from Adobe. Directions on both methods can be found here - http://helpx.adobe.com/acrobat/kb/windows-8-81-problem-11006.html