Power options missing, Apps frozen

I recently got my lenovo g500. (recently like 5 days ago) and every so often the power options disappear. I can click the power but nothing shows up to shut down, restart, etc. Also during this time I can go to the start screen but cant click any of the apps, not even the desktop, but I can Alt tab to it if i already had it open. I also cannot search for anything (it will say 'this app cannot be searched') and if I put my laptop to sleep the next time I open it I still cannot do anything and the wallpaper is missing. However during this time i can use anything on my desktop with no problem.

Like I said I just got the laptop so I haven't downloaded anything or updated yet. Any idea as to what the problem might be?