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there was probably no damage at all, just do a forced shutdown, and run CCleaner in safe-mode - this only works if the attack happened on a limited account of course. I believe Piriform now has a paid version of CCleaner that will clean all the accounts on a Windows PC. Haven't looked at it yet, though.

In that case, my theory is that you could boot to the admin account in normal mode and run that version of CCleaner from there. If any of your vulnerable applications or the operating system were not fully updated, all bets are off on that, though.