You've not indicated where you've encountered the program. (In your Start menu? In a list of running processes from the Task Manager? Hidden in a folder somewhere?).
It might be this:
http://www.tuneup-software.co.uk/
or this:
http://www.tuneupmedia.com/
but, if it's tuneup.exe it's almost certainly the Microsoft Maintenance Wizard:
http://support.microsoft.com/kb/186186
All of the above are harmless but, of course, it's always worth remembering that viruses and other malware can sometimes masquerade as something legitimate.
Chris