I use Windows_Loader_v2.2.1
So far in full scan and boot scan, scan it several times and it didnt show this file like threat so far.
But in last Full scan it show same file like threat " pub loader.exe... something like that. Cant say exactly the result name etc but if you tell me that is possible to see scan result in free version i will reply with full name of scan result.
As you are replying to a thread started almost a year ago, and one that deals with use of an illegal program at that, don't think any help you require is forthcoming anytime soon. Avast!, when a system scan is initiated, will alert not only to various malware, but also to PUP's (Potentially Unwanted Programs) if that option is selected. Pup loader.exe would be one such.
It's possible you did not know use of Windows_Loader_v2.2.1 is not legal, and all Avast! is doing is letting you know this is possibly a program you do not want on your system. Use of a PUP can be for good or bad, but once installed, the potential of destructive behavior and damage to the system always exists.