|Sounds like you want to watch cable to your PC? TV to tower or monitor. Either way, you'll need a capture card. Instead of pluging your cable/dvd player/sat cable to your TV, it would go to that card in the computer. OR, depending on the monitor, it may have that built-in.|
What exactly did you want to do?
If you bought the HDMI to DVI for your TV to your tower, it'll never work. Your TV is Input HDMI, not output and your tower it Output VGA/DVI.
AMD Phenom II X2 550 @ 3.11
Patriot PC2-6400 4Gig
Seagate 160Gig SATA
Seagate 320Gig SATA