I have refreshed your Caller ID/TV feature and I need you to please power cycle your cable box.(DCT700) Your DTA does not received this feature.
For your PC.
Has this feature ever worked? Here are the requirements. Is you Adobe Airup to date? Also I suggest un-installing the UCID client and downloading it again. http://xfinity.com/callerid/.
I will have someone follow up with you to verify if these steps resolved your issue.
2.33GHz or faster x86-compatible processor or Intel® Atom™ 1.6 GHz or faster processor for netbooks
Microsoft® Windows® Home, Professional, or Tablet PC Edition with Service Pack 3; Windows Server® 2003; Windows Server® 2008; Windows Vista® Home Premium, Business, Ultimate, or Enterprise (including 64-bit editions) with Service Pack 2; or Windows 7