TCP/IP needs repair - KNieze

Somehow or another my TCP/IP has gotten corrupted. So how do I delete and
reinstall? Highlighting the protocols in the properties box then grays out
the uninstall button. Any ideas other than a system restore?  I have tested
my computer in both a wireless and wired environment and it doesn’t work in
either one.  I cannot ping my local router, I get an error code of 1231, nor
can I see or be seen on the network.  I have an USRobotics 8054 router at
home, I went to a hotspot with a linksys router, and I went to my school
where they have both a linksys wireless and a wired LAN.  I worked with the
system admin at school and we could not get the computer to connect to
anything.  We tried automatically getting an IP address and we tried a static
IP address.