My Vita's touchscreen acted all wonky from the moment it was first powered up. It got to the point where I couldn't even put in my PSN credentials, and this was after updating the firmware. I couldn't close any hints, and I couldn't do things like type the letter "s". My wife, who gave it to me as a gift, has to now go back to Best Buy to swap it out.
make sure you reset your system so none of your account stuff is still on the system.
Want a option to buy avatar's on the ps vita's psn store. Then vote on the link by copying it to your web browser.