You expect so much help but give so small information on your problem. If you just uninstalled w:a and didn't reboot your computer, check if setup.exe is still running in the task manager thing, you will get that by right clicking on your task bar and choosing task-manager from the menu list. If setup.exe is running, click on it and select "stop process" or "end process" or something like that and then try again to install w:a. If it's not running, reboot your comp and try installing w:a again. If that doesn't work post some further infos about your pc, what Windows version ur using and so.