In Windows XP running I downloaded an advertisement from a website then uninstalled it. Now my Icons won't work, IE wont open but, will start to open the browser but then it closes. Executables won't open, At the time I was running an up to date Comcast provided Norton Antivirus suite. One error that is rendered is an "application can't be started, an internal error has occurred." Another attempt to open a program renders a "Access is Denied" notice. So I ran as local admin in Safeboot w/networking to no avail. Tried opening a user account page to make myself an admin which failed. While in Safeboot mode w/networking and attempting to open any applets in Control Panel I receive the notice "Windows cannot access the specified device,path or file. You may not have appropriate permissions to access the item".