WinXP 中毒．尋解救方法

有朋友部電腦 WinXP 中左毒, 令到部電腦開個 IE 上唔到網, 出左個「網頁無法顯示」的畫面.
Ping 出街都有 Reply 既, 但 IP 位置就變左問號, 同 BIOS 會有一下 Bit 聲:

C:\> ping hk.yahoo.com

Pinging w.hp.vip.hki.yahoo.com [?] with 32 bytes of data:

Reply from 202.43.220.99: bytes=32 time=21ms TTL=58
Reply from 202.43.220.99: bytes=32 time=20ms TTL=58
Reply from 202.43.220.99: bytes=32 time=19ms TTL=58
Reply from 202.43.220.99: bytes=32 time=19ms TTL=58

Ping statistics for ?:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 19ms, Maximum =  21ms, Average =  19ms

就算用「系統還原」都還原唔到, 咁除左重裝 Windows 外尚有Ｄ咩方法呢?