Hello,
Kindly try the following;
1. Click the Start icon
2 .Type in regedit
3. Select regedit from the top of the result
4. Go to: HKEY_CURRENT_USER\Control Panel\Desktop
5. Edit ForegroundFlashCount
>> Find ForegroundFlashCount
>> Double click ForegroundFlashCount
>> Replace the value for Value Data with 1
>> Edit ForgroundLockTimeout
>> Find ForegroundLockTimeout
>> Double click ForegroundLockTimeout
>> Replace the value for Value Data with 0
6. Reboot your PC.