Either reset the computer or go to task manager and close everything related to Adobe or Photoshop.
-Make sure PS can open other JPEGs.
-Try changing the name of the file.
-Try opening the file in paint and editing in. Even something very small, like get the pencil and make a little dot in the corner or make the smallest crop you can if it won’t make difference. Just something so that PS now sees it as a different file.
-Open the file in paint and save it as a BMP and try opening that.
-Lastly, try Googling the error. (BTW, I didn’t look at those results, I have no idea if they’ll contain your solution)
-Bump thread with success story, or let us know it didn’t work.
-Send jpg to one of the many dopers the will no doubt offer to try and open it on their own PC.