|"Searching the computer revealed:|
nuobo.exe-000cac6f.pf. What does that mean."
That means that it was found in the C:\WINDOWS\Prefetch folder and that at some time whatever program nuobo.exe is associated with it was run.
Go into Folder Options>View tab and select Show hidden files and folders, click Apply/OK then Start>Search>All files and folders and type in nuobo.exe and click Search. It's definitely not a Windows XP file.