check control panel -display-CAPTCHA Settings see if Graphics Library To Use For CAPTCHA is selected for one of the two that display below If neither display then you need to check if gd is installed on php or if the path changed for ImageMagick (Control Panel-Master Settings- Paths & Database)
Blue Man Group There is no such thing as stupid questions. Just stupid answers
Looks like you were set to use ImageMagick and the path changed. Call your host and ask for the new path. In the meantime I switched you to GD2 which should work.
Blue Man Group There is no such thing as stupid questions. Just stupid answers