I hope I can make this pretty clear.
Connect the Wii to the tv:
Use an HDMI from the Wii to the TV they both should plug into an HDMI outlet.
Connect the cable box to the vcr:
Use a coax cable into the VCR input and then another coax cable from the output on the vcr into the TV
Connect the DVD player to the TV:
Use and RCA cable with RED, Yellow, and White or Black Plug
Plug the cables into the video output on the DVD player and then into the video input on the TV.
This should get you all connected.
The computer issue not sure what you mean is wrong there, be more specific.
I have a cable box, an LG plasma TV, a Sony VCR/DVD player, and a JVC home theatre receiver with DVD player...and a Wii. I would like to know what cables I need (I already have some; realize I may need more) and directions on how to hook up everything, so that it all works. I am not a tekkie. In another room, I have a computer with cable modem and wired/wireless router. My laptop has a wireless connection to the router. I have lost my regular computer connection, so I know I will need to figure out how to reset this. I am happy to take photos and send via email. Thanks in advance!