Errors

Hi, I have a number of things going on and it is a massive learning curve. I had a HTTP 500 internal server error associated with my plugins.
After 1.5hrs with my server I found all the plugins had been removed from my site. I went through a process of coping and pasting them into a new folder which brought them back into my dashboard. Then I had to activate each in turn. Most were fine except: wordfence which brought up a HTTP 500 internal server error and wp-twitter likewise. A third, my-mapped-locations brought up a parse error. Those three were deleted and the site works ok. I have been onto the error log but think it is too long to add here. I would like to get them back, BUT how? I really hope there’s an expert out there. Cheers