What version of the Magick.NET-x86 DLL are you using? I have Kaspersky and it is not flagging any version of Magick.NET.
Also, if you download and extract a fresh copy of the DLL from Codeplex, does it give you a warning? If not, then it may be that the local copy of the DLL may be infected.
Also, if you download and extract a fresh copy of the DLL from Codeplex, does it give you a warning? If not, then it may be that the local copy of the DLL may be infected.