Hmm. Sounds like it's trying to install or start as a service? Tricky to know without seeing it.
What I would suggest is to remove the program from your startup folder. One the the easiest ways to find your startup folder is to click on the windows logo and F and look for a file or folder called startup. Double click on the folder that is found and the atomic clock link should be found in there. Rather than delete it move it to your desktop (just in case you decide you want to keep it in startup).
B.