Finder crashes permanently
You could just try reinstalling OS X from the recovery partition (see http://support.apple.com/kb/PH10763). It fixed a similar issue I had where different applications started crashing on launch. It keeps most user files and settings in place, so it might not fix account-specific issues though.

Or if you don't want to recreate settings, try copying directories like ~/Library/Preferences/ and ~/Library/Containers/ to the new account.