I had an automatic update for my Windows Vista (63 bit) on 2/24 and ever since then my Windows Media Center guide shows "no data available" for all channels. I tried redoing the setup about 5 times the zip code is correct, I tried manually downloading the guide but none of this works. I think something during the live update may have corrupted my guide. I've been using the medica center guide for several months & it never had this problem before. I use DirecTV. Can anyone offer any help for fixing this?