The answer is Document Inspector
Explanation:
I think that you might have used it a lot or its just a glitch and will come back after some time.
It might be that your screen cracked.
But try re-booting if that does not work, wait and take off the battery.
The answer is LinkedIn.
LinkedIn manage your personal identity. It also build and engage in your professional network. It access knowledge, insights and opportunities. It links people, skills and opportunities to create world largest crowd business creation system.
Answer:A
Explanation: Its cheap and easy to install