I follow all the instructions again from scratch. Disabled xcache from php.ini (restart IIS) then tried install again.
OnceI click install, Mysql connections begin to skyrocket! from 3 or 4 to 50 (spike) nothing seems to happen. Almost as if things are locked.
Same with IIS connections.
Check for the new gallery option in admin cp. It's still not listed there. Also, noting in plugins list.