Well the malware name HTML:Script-inf doesn't really gel with the actual files, as they aren't html files. So I can't even understand how the association would be made, e.g. a script tag inserted into an html file (which is basically want that malware name is saying).
What scan were you running ?
As given the file names these wouldn't normally be scanned in a Quick or possible even in a Full System Scan.
So most certainly an FP, send the samples to avast for correction:
Send the sample to avast as a False Positive:
Open the chest and right click in the Chest and select Add, navigate to where you have the sample and add it to the chest (see image). Once in the chest, right click on the file and select 'Submit to virus lab...' complete the form and submit, the file will be uploaded during the next update. A link to this topic wouldn't hurt.
What avast version are you using 5.0.x or 6.0.X as the folder location is ALWIL Software\..., which related to older versions of avast. If you are on avast 6, but updated from the avast 5 user interface, the old locations would have been retained. A clean install of avast 6 would have given Avast Software\...
Whilst that shouldn't be a problem, it is just useful information, as I certainly haven't had any detections on my other system avast 6 on win7 netbook.