I am walking through a tutorial for Photoshop but at one point they choose "Lens Correction" in the Filter --> Distort menu. I am on Photoshop 7 so I don't have this.
Is there anyway to do lens correction in this version of Adobe Photoshop?
PTLens includes a standalone program which will do lens corrections, which should allow you to do what you want.
However I don't know whether the PTLens plugin will work in PS7 or not.
Using PTLens standalone would involve saving your image as a (recommended) 16-bit TIFF and invoking PTLens on that image file outside of Photoshop before continuing your Photoshop work.