Hi,

please use the board search above first to read up on the existing advice for Blaster and Ncase

Blaster: Use avast Cleaner and then apply the necessary Patches, plus ALL Windowsupdates

Ncase: Where exactly was it found ? (Full path/folder/filename: see avast’s report/Logs)
try removing it with avast in SafeMode(F8-Boot) and use spybot and ad-aware