According to the information in the referenced KB article, this is a known problem with Adobe Systems. The suggested "workaround" didn't work. As it is now, I cannot open any PDF files, whether from Adobe Reader, within e-mails, or form a web page. This is causing me some problems since I frequently get reports in PDF form, and I have a need to open PDF forms within web pages.
I've been researching this problem for a while, never found a solution. Tried the workarounds I've seen, don't work, running XP pro, no acrobat. This has happened on at least 6 different computers that I've seen. Several users refuse to use adobe acrobat anymore.