My computer randomly gains Gigabytes GB's?

Crazy0arrow0

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Feb 15, 2009
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I check my computer's space reguarly everyday to see how much I have. I looked at it today and it was on 102Gb then suddenly about 20 minutes later it shot up to 121Gb and I didn't remove any programs from my computer, not even internet browsing histories. Does anyone know why this happened? Is it harmful to my computer?

Many thanks.
 
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