why i always have a red cross while i am downloading

azn_mafia88

i have read the forum.
6 w5 c8 L" Z6 J* L; t( gTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。they say the "red cross" mean no space on your computer
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but my harddisk is not full...how come it still doing that