Need help, Onehalf - 3666

About 2 weeks ago, i booted my laptop, and it went haywire, said I was infected with the Onehalf-3666 virus >:(. After I dealt with it ( im assuming its gone, as avast, malwarebytes dont detect anything), Im getting odd results on virus scans. My scheduled scans have several times com up as " no virus found" but it is in red as if it found a virus… not sure what that means ???, and what I should do about it. any advice would be appreciated. It also says that a virus was found 2 days later, but no files or virus showed up in the log… havent had a positive scan in about a week and a half. So, hope someone might be able to explain whats going on. Thanks in advance!

Please attach your logs.
http://forum.avast.com/index.php?topic=53253.0