Previously in windows explorer my pdf files had pdf icon. Now they are showing as a Word doc. I recently upgraded my Acrobat 8 Professional. Whats up Doc?

Previously in Windows Explorer (Using Windows 8.3) all my7 PDF files had an PDF icon! Now they are showing as a Word doc even though they are PDF's. I recently resolved an issue "The organizers database is damaged and will be reset the next time Acrobat is launched......" That appeared every time I closed a PDF file. I than updated Acrobat with all the newest updates. Now I suddenly realized all my PDF files are showing the Word icon.

Also, when I receive an Intuit invoice and select to save as a PDF, it generates a Word doc that is illegible! What happened?