You can start your Windows OS in Safe Mode and then easily delete the files in question.
(To restart in Safe Mode, restart your computer normally, and while restarting keep on pressing F8 continuously. This will bring up a screen wherein you can select Safe Mode. Safe Mode uses the minimum possible resources while starting and hence, any locked files can be deleted safely and easily.)
Its a good practice to uninstall via the Add/Remove Programs in the Control Panel, but since you do not have Reader 9 listed there, you can follow the above approach as well.
To be sure, I would advise you to recheck whether Reader v 8 s working properly after deleting the files.
Hope this works for you.
Hi: Thanks for your quick response.I'll give that a try and let you know how I make out.
I followed your instructions and afterwards I deleted some remaining files. Version 8 started without a problem and I have not had any problems for a month. So all is well.
Thanks again for you help.
It would seem to me that since Adobe knew that their Reader ver. 9 would not install and replace ver.8 without the proper resources that they might have programed in a message when it failed telling the user why!