Photoshop :: Layer & Channels Disapeared - Cant Retrieve

I'm on photoshop 7.0, which I've had for a while. I only had the windows layers & channels up , while I was working on some avatars, but then all of a sudden they just both disappear - out of the blue. So I think okay, I'll get them back, and click window >> layers. But both layers AND channels were still ticked, I unticked them and ticked layers again. But they still didn't become visble.. PLUS it wouldn't let be select them both at the same time. All the other windows, like paths, swatches etc still work fine, just layer and channel being a pain in the back side.