Any file with a "." is a hidden file. I usually just use Terminal to see hidden files using the "ls -a" command, but if you are not comfortable with Terminal then it will be difficult. There probably is some way to show hidden files in Finder, but I wouldn't know how.
Anyway, I deleted the .GlobalPreferences.plist file and still no right click. I even deleted the lockfile and nothing. Also created a second account, and right click is indeed selected by default. But, right click still doesn't work, even on the new account.
Just for good measure I booted into single user mode, deleted the .GlobalPrefences.plist files, and rebooted. STILL no right click.
The good news is I have almost trained my brain to use Control + Click, bad news, still no two finger right click.