Potencialy unwanted programPotencialy unwanted program

Hi! My McAfee virus scan online found  "Potencialy unwanted program" : Ad-aware-Gagor, but it says that this program cannot be cleaned, so I just deleted it by McAfee. From time to time I use Ad-Aware to scan for spyware. Can anyone tell me what is differ (in virus scan online ) between delete and clean virus(or sryware) ? And what is this Ad-aware potencialy unwanted program ?

Thanks for any help!

Dim 8250- WinXp pro- MSIE6 -McAfee Security Center