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Over writing will just bury everything on the drive and I DO mean everything.
Then you have to start from scratch again. I.E. do a complete clean install or image/clone back.
Gots to be careful, but a few programs do let you overwrite free space.
So no, ccleaner is not a virus tool.
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Even if we use antivirus updated forms or ccleaner we cannot assure our system is 100% virus free.
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Yep, kind of like we cannot assure we are 100% virus free. ;)
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Once virus has attacked in laptop,system,hardisk or any other electronic devices we cannot remove 100% until we format.Through anti virus programs we can prevent up to some extent but not entirely