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Make sure you do not have an open FTP server running and someone is tucking loads of data deep in your file structure. There is also a hack out there, comes in via FTP, that creates folders with a space in the front of them. This makes the files not viewable by windows. If you boot to NTFSdos you can see the folders, but you can't delete them. This is, most likely, way beyond your problem, but I had it happen a few years back and I WILL NEVER open up FTP without knowing exactly what is going on.<br />
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Nickname....Paranoid Pete &nbsp;here !
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Make sure you do not have an open FTP server running and someone is tucking loads of data deep in your file structure. There is also a hack out there, comes in via FTP, that creates folders with a space in the front of them. This makes the files not viewable by windows. If you boot to NTFSdos you can see the folders, but you can't delete them. This is, most likely, way beyond your problem, but I had it happen a few years back and I WILL NEVER open up FTP without knowing exactly what is going on.

Nickname....Paranoid Pete  here !

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How much space are you losing? &nbsp;Do you think that it's because of virtual memory or System restore points?
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How much space are you losing?  Do you think that it's because of virtual memory or System restore points?

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My c drive space just increase without any main reason.I have scan for virus but found none.
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My c drive space just increase without any main reason.I have scan for virus but found none.

hard disk

Hardware includes cell phones and other digital living devices, tablets, computers, servers, peripherals and components, printers and scanners, gaming consoles, networking hardware such as routers, hubs, switches and modems, storage devices and security equipment such as firewalls and other appliances.