jaypee

hi!
i installing a new network card 3C905B-TXNM fast ethernet link XL PCI.my old
one is 3C905B-TX fast ethernet link XL PCI.
i uninstall the old one by removing the services and TCI/IP on the network
properties.when i try to install the new one theres a setup message occur
saying "Registry subkey already exists" then when i click ok theres another
one appear saying "Unable to remove Name space provider" then i ckick ok
..when i ask if i have a DHCP i choose yes then error message appear "The
network failed to start"
i cannot install the network card.
please help.