ok.... i delete ALL files and folder in folder "download " ?
sure ? help me...
No, I don't think so...
C:\WINDOWS\SoftwareDistribution\ is a system folder that should remain there.
Maybe update your virus database and send the files to Chest, rescan them within Chest some days later and check if the files are still being detected.
The error in your log (fine del file, end of the file) is weird (for me)...