Why, dear user, do you think we here are on avast?
This is just one of the disadvantages of free av scanners. Yes some only scan and won't disinfect until you decide to buy the product. Nice marketing scheme isn't it?
Online scanners do not perform when you do not have a stable internet connection, some malware may cause just that. Some smart malware may cause that the scanner won't start unless you rename the executable for instance. Sometimes you have to switch to a particular browser and install activeX before the scanner can run at all. In your case the Panda online scanner can find infections, but does not offer the removal of the malware that is being detected.
Have avast in combination with MBAM and SAS free anti malware and your will be good to go,
polonus