We upgraded from Adobe 4.0 to 6.0. Now I have a user who cannot open PDFs from the internet or Intranet. A separate box opens, the status say installing components, then disappears quickly leaving a red "x" in the upper left of a blank box. We can open PDFs already saved on the PC. I've tried tweaking IE settings and those in Edit>preferences in Acrobat. It's like it is installing Adobe as a plug-in. Any suggestions are appreciated, thank you!