I think the reason you couldn't create a new layer was becuase the file was INDEXED.
When you open up a .gif file in photoshop its colour mode will be set to 'indexed'. If you want to resize or change colours then change the colour mode to 'RGB' before doing any editing
Otherwise you will get very jagged edges, colour problems and no ability to use layers.
IMAGE > MODE > RGB
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As pI said, it's probably because it's an Index file.
In that case go to Image > Mode > RGB Color
If a layer is locked, open the layers palette (windows > layer), select the layer that's locked and then click the lock at the top of the layers palette.
If it is a gif animation, open the file in photoshop as normal and then open the animation window - Window > Animation
All these depend on which version you are running but generally they are the same.
Thank you everyone, I finished them by creating a new one the same size and just copying the image over, then I could work on it but shall try the RGB thing next time.
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