C:\Documents and Settings\Administrador\Os meus documentos\ANTIVIRUS\outro\sysclean.exe
Acoording to google, it could either be a false alarm in TrendMicro's VirusCleaner, or a backdoor/trojan; but then avast wouldn't say REDLOF, right ?
So, most probably a false alarm:
Do/did you ever have(use) PcCillin or TrendMicros Onlinescan HouseCall ?
if Trendmicro/pccillin is not installed/active an the PC:
boot the PC in SafeMode or DOS, and then move the file to a new, empty folder..
scan it there ONLINE with Trend & KAV (see below) pause avast Shield for this
if the 2 above don't detect anything in it, then it's a false positive: please send it in to
virus@avast.com , best in a password-protected ZIP- or RAR-archive.
Include problem description and link to this topic + ZIP-password in the mailtext