So you want to remove the entry in the start menu programs list?
Or do you want to uninstall the scanner software and start again?
Are you logged on as Administrator when you try and do this?
Also you could start your computer in SAFE MODE and do whatever you want in safe mode.
To start the computer in safe mode. Just restart your computer and keep tapping the F8 key then choose SAFE MODE and do what you want from there.