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Turn on the computer and enter your BIOS (the method for which will vary by the manufacturer and model) to set the time and date since it's been cleared with the CMOS, then save and exit.
As Windows cannot delete itself, you need a live system with which you can boot your computer from a CD/DVD or USB stick. You can then delete the data on C: from there.
Turn on the computer and enter your BIOS (the method for which will vary by the manufacturer and model) to set the time and date since it's been cleared with the CMOS, then save and exit.