The vast majority of searches for "SolidWorks host file block" originate from users attempting to use versions of SolidWorks. Here is why the hosts file is the weapon of choice for crackers:
You cannot save changes to this file without administrative privileges. Start Menu , right-click it, and select Run as Administrator In Notepad, go to File > Open Paste the path C:\Windows\System32\drivers\etc into the address bar. Solidworks Host File Block