Try this with one of the files:
1 - download from Toad's Cellar and unzip Convert to JPG and Embed sRGB profile.
2 - drop a copy of one of the photos (before you fixed it) onto the app.
3 - import the resulting file into iPhoto.
If that works then you can batch change all of the new files coming over from the PC by selecting them all and dropping onto the Automator workflow app. As a precaution don't run it on originals as they are deleted and reiplaced with the new file like the note says
My mistake - my message should have said "no capital letters" not "all capital letters". And you're missing the space after "file" - so this would have worked
file /Users/rachel/Pictures/Asia holiday/Stanley/Pokhara/DSC_5003.JPG
It's probably still worth doing, it may tell you what's wrong and then you may be able to avoid the issue in the future.