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Welcome aboard.  It's good to have you.

The image you posted looks like a result of what is called "bit rot"  (Google it).  It affects JPGs by making certain areas in the image have different colors, patterns, etc.  The effect will look different in different photo viewing software. 

That being said, there are other possible causes, so to exclude these, why don't you (a) post one of the JPGs that is giving you problems, and (b) test if it occurs only on older JPGs by downloading a new JPG (say, from the web), and trying to open it in PS, as well as other photo viewing software on your system.

Cheers,

Tom M