how do you uninstall mesanger beta from win98?

Re-installed windows after fixing up some problems in my home
computer, and this is what is still unresolved:
- at Win startup and before logo shows on screen, it asks "press F1 to
continue, DEL to enter setup". Never did this before.

Does anyone know how I can correct this problem: When I
shut down my computer from the START tab this blue screen
shows up with this message; Windows  A fatal exception 0D
has occurred at 0317:00009D3E. Then I press the Ctrl +Alt

A friend has just upgraded his OS from win98 to win98se and has encountered
a couple of problems.
1. When he does a shutdown the pc re-boots.
2. The Windows tour page continually appears even after unchecking the 'dont