If the tablet acts extra whacky and the install software causes a problem and you can't figure out the cause, you need to boot into Safe Mode to fix issues for a bit. In Safe Mode, all third party applications you have installed are disable and only system apps leave behind.
How to Enter Safe Mode on Nexus 7 Android 4.1 Jelly Bean
* Simply press and hold your Power button.
* When you are prompted to Power off, go to long press on "Power off" until you see the Safe Mode menu comes.
* It will ask if you want to reboot into safe mode. Touch "OK" button.