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I do not know why a locked JPG would mess up PS. I could see if you always tried to launch PS, by dbl-clicking on the JPG in Windows Explorer, but not from your Desktop shortcut, or from the PS.exe file.
For the locked file, there is a freeware utility, Unlocker. I do not have a URL handy, but Google should find it for you. It has worked on some network assets, that seemed to lock up on me.
Good luck, though this might not address your PS launch issue.
I think the "file is locked" issue usually relates to the preferences file, and more often than not is related to a permission problem. might also have to do with a registry hive that ps needs to update...
do you see the issue when logged in as an administrator?
this link tells what permission you need (for a non-admin user) to run photoshop:
You could try resetting your preferences the manual way as described in the FAQ.
Very strange that an individual image file should corrupt Photoshop settings though.