|If the computer is running ok, I don't understand why you need to boot into safe mode.|
Start > run and type
under the boot.ini tab select safe boot and save and exit.The next reboot will boot you into safe mode...to return to regular booting uncheck the option save and exit.
If the option is greyed out then you must highlight the boot partition in the window above the safe boot option and it should becone available to be checked then.
Change Is Good