I'm assuming that you were trying to install Adobe Flash Player. The best thing to do would be to remove Flash Player from your system entirely, and then try a clean install. Please go to http://kb2.adobe.com/cps/141/tn_14157.html
and click on the link following the word "Windows" below the text "1. Download the Adobe Flash Player uninstaller." Save this file to your desktop. Shut down ALL programs that you have running. Look in the system tray (next to the time) to make sure that everything is closed.
Run the uninstaller by clicking on the file that was placed on your desktop. You may be asked to restart your system. If you are, please do that before going any farther.
Once Flash Player is completely gone from your computer, please go to http://www.adobe.com/shockwave/download/triggerpages/flash.html
. Wait for a few minutes. When Flash Player is reinstalled, you will see a quick Flash animation in the middle of the lighter blue box telling you that your installation is complete.
Each time you upgrade your Flash Player, you should use this routine to ensure that no parts of the old version are left over to cause problems for the newest version.
Hope this helps! Diana Wellspring