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When C drive is running out of space in Windows 7 computer, if you open File Explorer or My Computer, C drive will be shown as red instead of default blue. Some people succeeded reusing disk space but C drive becomes full again in a short time.
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This issue is annoying, because many people do not know why and what to do. It is very common that system C drive getting full in Windows 7 both 32 and 64 bit.
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