問題很難說，試試這樣

為了和硬件匹配及與ISP提供的網速匹配，設置網卡的網速有時能解決這種問題。右鍵點桌麵上的，my network places,在打開的窗口裏右鍵點local area connection.選擇properties。click the 'configure'botton at the up right corner. Select 'Advanced',there should be a 'link speed &Duplex' option or similiar option. select this one and in the right window, choose something else other than what you are current using. I suggest you try the 10M,half duplex first. Good luck.