why i always have a red cross while i am downloading

azn_mafia88

i have read the forum.
+ t& M1 E2 Y4 s6 I, W. d2 ithey say the "red cross" mean no space on your computer公仔箱論壇4 i2 s/ V4 O  Z% [
  C% H! Q# @: z* }( @9 l/ J5 W
but my harddisk is not full...how come it still doing that