why i always have a red cross while i am downloading

azn_mafia88

i have read the forum.
; N/ J! O( D; g2 z9 O' X* qthey say the "red cross" mean no space on your computer
- N( K1 l- P9 \7 ~  `' qtvb now,tvbnow,bttvb ) U9 ?! Y% z9 F
but my harddisk is not full...how come it still doing that