If there's a bootable disk (preferably your Windows 7 recovery disk, if you want to go back to factory conditions) and the drive is working, it will boot from it and let you install Windows or the factory image).
If it's the wrong disk, it's not bootable (try on another PC) or the drive is defective, it doesn't work. Then you need another disk or another drive.
Are you sure ccleaner deletes all contents of the hard drive? Or just of the c:-partition? In that case, there might still be a recovery partition to boot from. How to do that depends on make and model of the laptop.
Kees
Yesterday I used Ccleaner to erase my old laptops hard drive, as I plan to sell it on and didn't want to leave any personal data on it. I was planning on reinstalling Windows 7 on the laptop, but every time I turn the laptop on I'm met with a screen saying "BOOTMGR is missing Press Ctrl + Alt + Del to restart" . I can access the BIOS, and have changed the boot order so it boots from the DVD drive first, but it still shows the BOOTMGR is missing screen. Anyone know what I can do to fix this problem?

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