Hi Augusto
What You descibe is not normal
Or your Windows is broken
Or You got a (Boot)virus
If Your bootdisk is not a MBR disk, then goto next B
Download Bootice, a MBR Utility, at
[You must be registered and logged in to see this link.]Run,choose your bootdisk
Push MBRCurrent MBR Type should be Windows NT 5.x MBR or Windows NT 6.x MBR
If Unknown probably You got a boot virus
Select Windows NT 5.x:/6.x MBR
push Install/Config,push Windows NT 6.x MBR
next B
Download Kaspersky Rescue Disk 18.0.11.3 (11.07.2020) :
[You must be registered and logged in to see this link.]Install onto a cd and boot from CD,Scan your Disks
If no virus fond then your windows is broken, Install an new Windows from an original windows
and Winreduce again like a told you
icy