Norton GoBack error message 118

Help.  On startup of Windows XP I get the subject message window in apparently safe mode (big pixels). The text states that GoBack was attempting recovery on Disk #1 and gives an option to continue or not. It appears immediately after the boot screen. However at this stage the mouse (wireless and USB tried) and keyboard are both inactive (no laser light on mouse) so there is no way to get past the screen. I have tried booting from my system recovery disk that gives me the option to boot from CD by pressing any key but the error message screen immediately appears with the same result. Similarly pressing the function keys during startup has no effect and the error message screen appears again. Rebooting computer has no effect. Can’t see how to get past the screen.