Unable to connect to internet on Windows XP

Hello,
On my Windows XP operating system, I am not able to connect to the internet linked with a LAN line.
I have tried to find help from other forums and have followed a service but that was not working (DHCP CLIENT) and I'm getting an error 1075:
“System error 1075 has occurred.
The dependency service does not exist or has been marked for deletion.”
I believe it means that NetBT has to be set up, but that is nowhere to be started.
Then I tried a few things through Windows XP installer disk but it didn't work.
Lastly, I tried to system restore, but it was not working either for all the restore points.
All of these have been done on safe mode.
I am frustrated.
Please help.
Thanks.
