All the links on my taskbar and in the list of programs suddenly changed to Adobe icons. I'm running Windows 7. The links are unusable, as they all open Adobe, which doesn't recognize Word, Excel etc. In the end had to uninstall Adobe Reader X. I tried reverting to Adobe Reader 9, but same problem.
See http://helpx.adobe.com/acrobat/kb/application-file-icons-change-acroba t.html
[topic moved to Adobe Reader forum]
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