my-c-drive-in-windows-7-is-nearly-full-but-is-not-real

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See if you have shadow copies enabled. Restore points could be eating up the HD space. Open My Computer and right-click the C: drive. Select Properties. Go to the Previous Versions tab. Do you see a lot of restore points? If so, they can be removed, or disabled altogether. Open the Control Panel. Control Panel > System and Security > System Click System Protection in the left pane. Highlight Local Disk (C:)(System) and click Configure... From here you can press Delete to remove all the restore points and then reduce the Max Usageslider lower to something more reasonable. There is also the option to Turn off system protection if you really low on disk space. Thanks to : wiki and  http://superuser.com/questions/450284/my-c-drive-in-windows-7-is-nearly-full-but-is-not-real