I did that bc avast told me to do it(the very same day before it has been fixed ,
,untill my son didn't tell me to wait,could be FP)
But,I got interesting reply on some other Forum :
Default Re: Avast antivirus - rootkit false positive? - sfloppy.sys
maybe hardware related as far as an overly dusty case(fans,cpu,heatsinks)or a failing power supply, symptomatic of a case not responding to a power on restart immediately.try a thorough internal case cleaning with canned air and fine grade brushes.
Thank you for your reply !