Windows: Error opening installation log file. Verify that the specified log file location exists and is writable

Warning: Use of undefined constant user_level - assumed 'user_level' (this will throw an Error in a future version of PHP) in /homepages/3/d98111892/htdocs/insanelabs/htdocs/wp-content/plugins/ultimate-google-analytics/ultimate_ga.php on line 524

I got around it by creating a new administrator account. Log on/off the new admin account and try the install task again.