Droid is semi frozen, could be virus? I can't even turn off my droid or answer calls!

Okay, so I was on my usual bike ride listening to music, while I was searching to see if there was a way to hack into the volume settings for my droid. Then, the Market screen pops up with this Tapatalk app of which I didn't even want to download. I pressed the back button several times, then the home button, then I tried every button possible to get the out of the current screen. All failed! I pressed the shutdown button, the phone options screen came up, but it won't let me shut down my phone or let me follow through with any other of the options. My music continued to play, until I recieved a call from my mother, of which I couldn't even answer! I'm so confused! The screen came up normally, yet I couldn't even answer the call, the answer button wouldn't side!
I also have the correct time and battery updated, as well as notifications. But I can't get of of this screen to view anything. It's driving me nuts.
Is it a virus?