In win98, start your PC in SAFE mode (gently tap the F8 key about every second after you switch on). If you can remove McAfee from Add/Remove then do it otherwise go to START, RUN, type sysedit and remove all reference to McAfee in the autoexec.bat file. You can also RUN regedit ( a bit more dangerous) and select FIND in the EDIT tab and enter McAfee and delete all reference. Do the regedit only after the other options if they don't work.
Jim McLean