memory disappear

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    Windows 7 14 GB memory loss

    Running Windows 7 64bit on Samsung 4gb ram 500gb. On 17-7-15 I had 395gb free memory on the 18-7-15 I had 390 GB used. 5gb used although no downloads. I have not downloaded any large items and it now shows that I have 381gb free. Can you suggest as to why I have used 14gb on my C: drive without...