粉色茶花品种及图片:我的网速突然很慢

我的电脑网速突然变的很慢原来下载七八百KB，现在1KB都不到。
我重装了系统但还不行，请教高手 在线等 以下是ping网关和本机参数
Microsoft Windows XP [版本 5.1.2600]
(C) 版权所有 1985-2001 Microsoft Corp.

C:\Documents and Settings\Administrator>cd\

C:\>ping 192.168.1.1

Pinging 192.168.1.1 with 32 bytes of data:

Reply from 192.168.1.1: bytes=32 time<1ms TTL=64
Reply from 192.168.1.1: bytes=32 time<1ms TTL=64
Reply from 192.168.1.1: bytes=32 time=1ms TTL=64
Reply from 192.168.1.1: bytes=32 time<1ms TTL=64

Ping statistics for 192.168.1.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 1ms, Average = 0ms

C:\>ping 192.168.1.125

Pinging 192.168.1.125 with 32 bytes of data:

Reply from 192.168.1.125: bytes=32 time<1ms TTL=64
Reply from 192.168.1.125: bytes=32 time<1ms TTL=64
Reply from 192.168.1.125: bytes=32 time<1ms TTL=64
Reply from 192.168.1.125: bytes=32 time<1ms TTL=64

Ping statistics for 192.168.1.125:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms

C:\>
好象不行，我是从网吧拉的线
家里两台机子，台式没问题。
重装系统也不行，我只是把c盘格了重装的系统，d盘有重要文件没有重装。网速现在出奇的低 。但是能上。是不是中了病毒？
求救高手！