Hope this will help you - I have a Samsung tablet with Android 4.4.2. I have had the same problem starting about a week or 2 ago. Finally got help by doing a search on my PC and landing at Google support itself. The solution for me was to update and reset the date and time on my device. As explained by the help site, this syncs the device with their servers. The help site works by presenting trouble shooting steps to perform. If that doesn't resolve the problem, click "No" and a new set of steps is presented. I would post the link, but I'm not allowed as I am a new user. However, do a search of "Google Play Help" at "support.google.com" and the title of the help article is "Play Store won't load or download apps". Good luck!