Galaxy S3, Messaging stopped working and touchwiz stopped working.

Had been spending alot of time transferring pics from internal memory to external memory. Then installed a task killer to improve RAM. Then uninstalled zooper widget which removed a weather widget from my home screen.

Was ok for a while then got the msgs 'Messaging has stopped' and 'Touchwiz has stopped'.

Have a black screen, can get to settings from the notification bar. Have deleted data from Touchwiz. Have changed the homescreen from basic to easy and back to basic. Have restarted numerous times and removed the battery.

I have nova launcher installed. How can I get nova activated as i have a black screen and no other options but settings?

Is there anyway I can backup?

Have important data on device and dont want to do a factory reset if I can help it.

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