htc desired 816 freezed.....

hey guys ... this is my first thread.. today i rooted my htc 816 as per tutorial given on this forum.. it all went smoothly and root was successful.. then i installed purify.apk from internet and clicked on purify...
and my phone just freezed up. i m not able to operate it.. cant even switched it offf... plz plz plz help..
sorry for creating new thread...