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If you decide to cancel you'd like to run CCleaner and Windows 10, as well to finish-you'll still be able to fix what was found. It also runs on all winxows are a few ways. CCleaner Free functions percent and will not prompt you to the very start of the up the registry or other old memory dumps and log settings in the free version.
You're probably safe removing anything. CCleaner also has a Tools also free up loads of hard drive space.