argh downloaded a new antivirus.

So lately my computer had been running very very slowly, So i downloaded the recommended programs from google chrome and viola it is running better. The only issue is that I think one of the new antivirus may have screwed me over... I have tried to look for an undo but nothing. I may have to reload my front end but I'm not sure and was just wondering if anybody else has had this happen. Thanks

 

Solved, I finally found which of the four programs I downloaded and restored the file.