How remove iFrame from wordpress admin panel?

I开发者_运维问答've some problem with iframe at the WordPress admin panel. Can you tell how to remove it? and how to secure WordPress with similar problems?

See FAQ: My site was hacked « WordPress Codex and how-to-completely-clean-your-hacked-wordpress-installation. If you use NetSol for hosting, see WordPress › Support » attack on wpress 2.9.2

Here is a discussion of how many others have fixed this.