Hi there.
Just a couple of questions, are you making sure that the Easycap is plugged in to a USB port which is enabled? Sometimes if you have multiple USB slots on your PC/Laptop, only some of them are enabled, and others are turned off for power saving (especially if you have a laptop).
Also, which version of the Easycap do you have? Which operating system, and also have you installed the drivers for the Easycap?
We're definitely happy to help, just need a bit extra info as to what you have/what you've tried etc.

Fenberry