^ & ^^ added after .jpg files

I am working on a computer that has a number of .jpg files on them.  A lot of them have been changed to .jpg^ or .jpg^^ and thus cant be opened.  I have worked on changing some back by hand but it is going to take a long time as there are over 1,000.  Not all are like this.  Any one know what might have caused this or if there is a easy way to change these all back?
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lherrouConnect With a Mentor Commented:

First of all, have you tested your images to make sure what once you change the file extension back to JPG, they still work? Also, you might consider dropping to DOS or using a file renamer like Flash Renamer (http://www.rlvision.com/flashren/about.asp) to assist you? You should be able to large numbers of files in a few minutes.

As far as what might have caused this, I would lean towards either corruption of the HD, or some malware on the system.

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