I'm battling with the way the gradients are managed by Photoshop 7.0

I want to use a gradient I've previously created but can't seem to find it in the Preset display of gradients. I know it's saved in the standard Gradients folder, and I can see it if I choose Load.
How do I choose it if it's not in the Preset display of gradients?

What I've tried:
1. In Gradient Editor I found the gradient I previously created by clicking the tiny arrow at the top of editor. I get a message: 'Replace current gradients from redwhitetr70.grd?' I don't want to lose the gradients created so far. Will this happen?

2. I've also tried to 'Load' the gradient created but I get a message: 'Exceeded the maximum number of gradients. One or more gradients were not read'. What does this mean?

Thanks for any tips!
spinningjennie