| | Re: where is everything
With the device on, remove the battery for about 30 seconds. Replace it and let the device reboot. Does that fix it? If not, you might have corrupted a file and will need to wipe and reinstall the OS. And if you do not have a backup, all your data could be lost.
And you should not just unplug the device from your PC. You need to use the "remove device" wizard".