Why should I use the online scanner if my virus def. is up to date? Does it detect viruses not included "at home"?
Just a general remark from me. There is no application that detects all malware. Although Avast is very good it can't (just like all the others) detect everything. When in doubt, always double check with other scanners. When it is just 1 or a few files you want to check I would say use [url=http://virusscan.jotti.dhs.org/]JOTTI[/url], if you want to scan many files, use at least two online scanners. (links to several of them can be found on the page in my signature)