Can connect to Internet but can't open any site ?

From the command line, type
ping127.0.0.1
ensure local connectivity is good..

then
nslookup -A google.com
This will ensure the DNS is correct...

then
pathping google.com
to see where the point of failure is.

Please post any results here...

Dave

Here is the result :

Microsoft Windows [Version 5.2.3790]
(C) Copyright 1985-2003 Microsoft Corp.

C:\Documents and Settings\Administrator>ping 127.0.0.1

Pinging 127.0.0.1 with 32 bytes of data:

Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128

Ping statistics for 127.0.0.1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

C:\Documents and Settings\Administrator>nslookup a google.com
*** Can't find server address for 'google.com':
DNS request timed out.
    timeout was 2 seconds.
*** Can't find server name for address 208.67.222.222: Timed out
Server:  UnKnown
Address:  208.67.222.222

DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out

C:\Documents and Settings\Administrator>pathping google.com
Unable to resolve target system name google.com.

Okay, can you pathping to 64.233.167.99?

Ok here it's :

Microsoft Windows [Version 5.2.3790]
(C) Copyright 1985-2003 Microsoft Corp.

C:\Documents and Settings\Administrator>pathping 64.233.167.99

Tracing route to 64.233.167.99 over a maximum of 30 hops

  0  SERVER [64.22.98.168]
  1  VZWIN36 [192.168.43.99]
  2  64.22.98.1
  3     *        *        *
Computing statistics for 75 seconds...
            Source to Here   This Node/Link
Hop  RTT    Lost/Sent = Pct  Lost/Sent = Pct  Address
  0                                           VPS125 [64.22.98.168]
                                0/ 100 =  0%   |
  1    0ms     0/ 100 =  0%     0/ 100 =  0%  VZWIN36 [192.168.43.99]
                                0/ 100 =  0%   |
  2    0ms     0/ 100 =  0%     0/ 100 =  0%  64.22.98.1
                              100/ 100 =100%   |
  3  ---     100/ 100 =100%     0/ 100 =  0%  SERVER [0.0.0.0]

Trace complete.

C:\Documents and Settings\Administrator>

The hostnames are definately not resolving, though it looks like the traffic is going off net okay.

Can you post the results of an ipconfig /all ?

How is the server configured? I.e. is this functioning as a DNS server or Domain Controller itself? Check that the DNS services are running by looking in the services manager, and also check the event log for any messages pertaining to the DNS services.

I have checked that the DNS service is running and here is the ipconfig :

Microsoft Windows [Version 5.2.3790]
(C) Copyright 1985-2003 Microsoft Corp.

C:\Documents and Settings\Administrator>ipconfig /all

Windows IP Configuration

   Host Name . . . . . . . . . . . . : SERVER
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Peer-Peer
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter vznet0:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : 3Com
   Physical Address. . . . . . . . . : 00-FF-D2-FE-AE-CB
   DHCP Enabled. . . . . . . . . . . : No
   IP Address. . . . . . . . . . . . : 64.20.90.170
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.43.99
   DNS Servers . . . . . . . . . . . : 208.67.222.222
                                       208.67.220.220

Ok I will do that. Thank you very much for your help.

No dramas - hope everything works good for you..