Hello Marcel6969, We seem to be going in circles. ;-)
Noting you have 3 operating systems you can use to boot the computer.
Windows 7 Pro
Windows 10 Pro
Windows XP Pro (Service Pack 3)
I'm sure you realize Win XP is no longer supported by Microsoft.
See:
https://forums.spybot.info/showthread.php?425-UPDATED-WINDOWS-Your-first-line-of-defense&p=446431&viewfull=1#post446431
Please list all security programs you have installed on each operating system.
Also, which edition/s of Spybot do you have: Home, Pro, Business or Tech. You may have informed support already but it can be posted here for clarity thank you.
Best regards.