Client Services for Netware

can someone please help me?

Assuming you're using some flavor of XP:

Start>Settings>Control Panel>Network Connections

Locate the connection to be modified, Right-Click, select "Properties", under the "General" tab, click to highlight "Client Services for Netware", click "Uninstall", confirm, click "OK", reboot.

Other flavors of Windows will have pretty similar provision.