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To get Photoshop 7.0 (or 7.0.1 in my case) to work under Windows 7 64-bit, I ran the CD's Autorun under Windows XP service pack 2 compatibility. I also set the same compatibility prefs in Win 7 for the setup.exe file in the Photoshop directory of the CD-ROM.
You'll possibly encounter an error about the scratch disk being full - this is because PS 7 fails to understand big hard drives (the mega free space number looks like an empty disk, it's kinda like a Y2K problem, since PS7 programmers or the API writers never imagined so much free space, I guess). In this case, two things are important:
I recently started having this exact problem after upgrading to Photoshop 13:
But it isn't solved by the suggestions there for me. I know it's an old topic, but I'd like to get that discussion going again to see if anyone else is still having this problem.