Qualfications for this response ... don't run Windows myself but have assisted folks.
Suggestion ... to install any Moodle version that has issues with the 'special javascript' protections for admin password, use the command line install.php script found in moodlecode/admin/cli/
That will prompt for the same information ... like path to moodledata directory so locate before executing the install.php. Same for DB user DB password, DB name, etc. Takes apache server out of the loop on installs.
After you get site up and running, probably a good idea to execute the script in moodlecode/admin/cli/ to purge the cache.
Moodle caches a bunch.
Extremely important to set up a cron job for Moodle. So first thing ... before themes/content ... get that working properly on your platform.
Good luck!
'spirit of sharing', Ken