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You have probably prevented any damage but you should now temporarily disable System Restore in order to delete the restore point that is holding the malware.
After a reboot you can re-enable it.
You might want to keep an updated copy of Makwarebytes (free version only) installed and run occasionally as a precaution . It's always wise to have some extra anti-malware tools handy.
System Tool was a head scratcher... I could not find any signs of the method by which it was starting itself at boot either in my registry, msconfig or Start menus.
So along the same line as the original post I ask: presuming that the System Tool .exe has been deleted what is the likelihood that either Malwarebytes or GetSUSP will detect any registry settings by which System Tool can reload / regenerate itself?