You MUST NOT delete your hosts file. It is a system file, and vital. BUT sometimes malware puts stuff in there to stop Adobe software licensing from working. Sometimes malware comes with counterfeit Adobe software.
Anyway, editing needs to be done with great care. I suggest that before you try, you tell us what Adobe entries you find there. Here's how to do this (it won't try to fix the file):
Start a terminal (From Utilities in Applications)
Type the next line exactly (you can copy/paste)
grep -i adobe /etc/hosts
Please copy and paste what it says in reply. If it says nothing, type this instead