Kitu gani hakipo kwenye hiyo Windows yako? Kwanza hakikisha wewe ni Admin, right click My Computer, chagua manage, nenda kwenye Disk management, right click hiyo C drive yako chagua Shrink, ipunguze mpaka kiasi unachotaka C iwe. Ukimaliza kushrink utakuwa na UnPartitioned space, right click hiyo halafu tengeneza partition mpya from hiyo unpartitioned space.
Note: Kushrink inabidi uwe na continuous free space, so ikikataa kushrink inabidi ifanye defragmentation ile files zipangwe vizuri kwenye HD.