Adobe Acrobat/Reader Error

I have another error that has come from real world expe­rience.  I had a cus­to­mer that was run­ning Vista with Adobe Acro­bat Pro 8.1 (fully upda­ted) and Acro­bat Rea­der 9.1 (fully upda­ted) that was una­ble to open PDF’s from either email or a web page.  Every time it was tried, the follo­wing error was generated:

The Adobe Acrobat/Reader that is run­ning can not be used to view PDF files in a Web Brow­ser. Adobe Acrobat/Reader ver­sion 8 or 9 is requi­red. Please exit and try again

Even the sys­tem log gave such a cryp­tic error refe­ren­cing an unk­nown faul­ting module.

I tried everything inc­lu­ding: unchec­king the open PDF in brow­ser option in both Adobe pro­grams, res­to­ring Inter­net Explo­rer set­tings to default.  I was going crazy.

On the verge of unins­ta­lling and reins­ta­lling both appli­ca­tions, which is never my favo­rite option, I ope­ned the Rea­der and went to Help on the main tool­bar and selec­ted the “Repair Adobe Rea­der Installation”.

After that was com­ple­ted no more error.  I even tes­ted by switching the default pdf appli­ca­tion bet­ween Rea­der and Pro.  No further issues.

By loo­king around I see this is a very com­mon error with Rea­der 9.  I hope this helps.