It's time to pull down the shades and draw the drapes on Windoze. When you uninstall many programs, they only remove the executables. If you do some diggin' you'll see that the directories are still there. Your registry is full of things pointing to to programs that have been deleted ages ago. This will cause your PC to slow and in some cases go into the dreaded death spiral. There is a free program called ccleaner. There is also a pro version. Make sure you only get it from the original website or it will have all kinds of stuff you don't want in the package. Be careful when installing this or any downloaded program. Many will ask if you agree to the terms and what you are agreeing to is to install third party software. You can always "uninstall" them but they leave things behind. Sorry for getting off track. Ccleaner will clean out all your cached files which could take up a lot of space and slow down your pc. It can also clean your registry. You will always be asked to backup your current registry before cleaning actually begins. To get directly to the adobe reader issue, modify your folder settings so you can see invisible files and folders. In your home folder, you should see one called program data or user data, or something like that. I haven't run windows in a long time. Look in there for directories of programs you have deleted and get rid of those directories. These directories, among other things store information like program settings. When you install a program that has been deleted, these configuration files are already there and the installer freaks out because it thinks another version is already installed. Can't swear to it but that may be what is going on here.