Lenovo A3300 cant delete format or uninstall

Hi, I am in need of serious help since yesterday my lenovo a3300 tablet running android kitkat started crashing all the apps together and then it's hard to navigate through tablet bcoz of all that pop up of app crashed its written in popup "on top of it it says Time And Below it says unfortunately 'App name' has crashed" and it happens for all apps together constantly
And I can't even delete anything from internal storage it says task failed or cannot delete and i tried uninstalling apps but...

Lenovo A3300 cant delete format or uninstall

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