Blank pages after updates - Not IT Savvy

I am not IT savvy, so please be kind  -  I logged into my website admin account, and did some plug-in updates. Immediately after the updates, my website stopped working.

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I am lost as to what to do to get her back up and running. Is there a step by step set of instructions somewhere, or can someone please walk me thru this?  I have tried to logging back into the admin account, and the page won't even come up.  ( )

Please help!