Find your default.conf file (if using WinXP, in Documents and Settings\<user>\Application Data\codeblocks).
If you're up to some XML editing, open it in Wordpad. Find the <plugins> section and change their bool attributes back to "1" from "0". Save, exit Wordpad, restart C::B.
If you can't handle that, just delete default.conf, but be warned that all your settings will be lost.
Note: This will, obviously, re-enable your plugins. That doesn't necessarily mean it'll fix the crash...