Yep, it's a false positive as always. No need to worry.
No, this is a very good result. Have seen much worse results in past. Every scanner reports a different virus so this is a 100% guarantee that it is no virus at all. If it was infected all (or most of) the scanner must show the same virus, what is not the case here. Generic in the name of the virus normally is a proof it is no virus as this means the scanner could not identify a malware but saw some routines that can probably be used by malware. Due to the nature of AutoIt all executable are divided in two parts, the interpreter that runs the main script and the script itself. This is nothing uncommon but this also is something those stupid virus scanners are way too often detected as unidentified malware... Some weeks later this error is corrected (or not, if the tool is one of the worst av tools...)This does look quite alarming as 20% of the virus scanners report it as malware.