I have a new PC with a Tenda 150 Mbps PC 802.11 wifi card. All drivers are installed. The card finds my home router but cannot

Does your wifi have a passkey to login (aka is it secured?). Have you tried to access the router itself turn off your security and see if you can connect the new PC to it? Does it still not work with no security? If it does work then reenable the security and reset the password in the process, try your new PC with this new password.