BT 下蛓: NAT連接埠映射

我用緊 bitcomet 0.90 version
買過部新電腦之後裝既, (win xp sp2)

唔知點解比以前慢左好多, 次次都係得 >50kb/s
用哂好多方法都冇好到, 好似改regedit.exe, gpedit.msc, 防火牆設定, tcp port, download 埋 BTaccelator, BTengine 都唔得

不過發現個bitcomet 既 "綜合統計" 寫左:
NAT連接埠映射：失敗 [Microsoft (http://www.microsoft.com/)]

唔知關唔關事呢?