Please check the following points:
- Maybe you have defined your PmaAbsoluteUri setting in config.inc.php to an IP address and you are starting phpMyAdmin with a URL containing a domain name, or the reverse situation. Since phpMyAdmin 2.5 or 2.6 it's best to leave this blank.
- Security settings in IE and/or Microsoft Security Center are too high, thus blocking scripts execution.
- The Windows Firewall is blocking Apache and MySQL. You must allow HTTP ports (80 or 443) and MySQL port (usually 3306) in the "in" and "out" directions (some firewalls silently block cookies as well).