Hi, @FLOOD 1st, the clock is alway slow even my pc is active. 2nd. this problem started after KTS upgraded on the same day. I have checked the following after the issue found but nothing helped; Time zone is correct. The box of “Automatically adjust clock for daylight saving time” is ticked on Time Zone Settings window. The driver updates for “System CMOS/real time clock” and “System Time” in Control panel was done. CMOS battery was replaced. Virus scan was done. Thank you.