Right click the files in question (doc, jpg, etc.) Choose Properties.
Under the General tab, to the right of Open With, click the drop down and choose the proper application for the file (Word, Photoshop, etc.)
Click Apply and then OK.
This can also be done through the Control Panel under Programs and Features, in the sidebar on the left you'll see Program Access and Defaults. There you can redefine, system-wide, what application opens what type of file(s).
We have seen this phenomenon happening a couple of times under Vista and Windows 7. No solution has ever been found; all I can suggest is to uninstall Adobe Reader, then search for an alternate PDF reader.
Thanks. I found an old Acrobat (4.0) that I installed over much
Windows 7. A couple of work arounds and it does what I need at the moment.
I don't believe that Adobe is ignoring this problem. From what I read, the
condition existed in Vista.