What kind of PC is this?
Home or office PC?
That's because it's using Netware and is installed by an
administrator. If it's a coporate PC or it connects to a network
not belonging to you (meaning not a home network), you can't
uninstall Netware.
If it is your home PC or laptop, are you doing some networking
studies that require the usage of Netware? If you answer to these 2
questions, do this:
Start > Control Panel > Network Connections
Find your internet connections (most common is the Local Area
Connection). Right click and select Properties.
Scroll down to the part where it says 'Connection uses the
following'. Click on 'Client Services for Netware'
Then press uninstall.