I applied SP5 to 3 of my servers and had was unable to login using any
client from Win2k or WinXP machines (No Win98 machines had trouble).
After checking the errors and this forum, I could see that the problem
was most likely either NMAS or NICI or both.

Instead of disabling NMAS on the client, I uninstalled all NMAS and NICI
components using the ADD/REMOVE Programs applet in the control panel.

My questions are, Do I need these componenets? and
Did I hurt myself by doing this?

(We all login to local servers with no remote users.)