I am unable to switch users. I am using windows XP professional OS. The user switch option

Is disabled in the start menu. I am getting the following message "Client service for net work

has disabled the welcome screen. To restore these facilities you must uninstall client services

for net work" Pleas help me solve the problem.

Ok, first off lets get rid of the Netware stuff.
OPen control panel
Find Network connections (very easy if you switch to classic view)
Right click on Local area network connections
Properties
General tab towards the middle lists all of the installed protocols
Remove everything to do with Netware (highlight and uninstall)
You may have to reboot

Next bit.
Control panel
Find user accounts
Open
Advanced tab
Secure logon at the bottom, uncheck the box.