Thanks, I did suspect that might be the case but thought I better check before ignoring it. Thanks for the link to total virus, I'll use that next time :-)
Avira is telling me CloudDrive.UI.exe contains TR/Dropper.MSIL.Gen2 is it telling me the truth? This is the installer file I am using StableBit.CloudDrive_1.0.0.403_x64_BETA.msi