Sometime in the past month or so, I noticed that when I click on a web link (e.g. a link in an email), window displaying the "C:\Program Files\Common Files\System\MAPI\1033\nt" folder pops up. I do not go to IE or Mozilla. I have both and have tried changing the default browser, but it didn't help. I have to copy the link, open IE or Mozilla manually and paste the link into the address bar and that works.
If I click on a link inside a browser window, the link works fine.
Any ideas on what went wrong?