Photos converted to pdf files by Adobe 9.0??

I am a rookie user.
I recently downloaded Adobe 9.0 per a prompt on my PC.
I went in today to look at some photos that I have had on this PC for about a year - save in standard 'folder-file-jpeg' format.
Somehow, and I did not do this since I would not know how - 4 of my vacation photo folder had been converted to Adobe pdf files. That's about 1000 photos.
This is not what I want - and not the format I use.
How can I get them back to jpegs and stop this from happening again.
Thanks,
Ken

Berndt and David,
Thanks for trying to help me.
I have checked the following:
1. Photos in question now have a .pdf file extension.
2.I recently downloaded Acrobat.com, Adobe Air, Adobe reader 9.0 and Adobe Flash Player Active X.
3. I went to Control Panel, Folder Option and had 3 tabs to choose from: 1. General 2. View 3. Search.
I reviewed each option under the 3 tabs and I did not find an option to change or do anything with file extensions such as .jpeg, etc.
4. My OS is Vista Home.
Please advise next steps or some idea on what I can do, try, chcek on for you, etc.
Many thanks! I am grateful.
Ken

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