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Click Here to Download this program (its free). Install it. Update it. Run a FULL scan of your computer (took about 30 minutes and the viruses didn't pop up until the very end of the scan). Delete ALL of them (note: you have to reboot to delete the ones in windows system 32) There will be a list of about 5-10 infections they should be similar to:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\tdssdata (Trojan.Agent)

HKEY_LOCAL_MACHINE\SOFTWARE\tdss (Trojan.Agent)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\Tcpip\Parameters\NameServer (Trojan.DNSChanger)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\T cpip\Parameters\NameServer (Trojan.DNSChanger)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet003\Services\T cpip\Parameters\NameServer (Trojan.DNSChanger)

C:\WINDOWS\system32\tdssadw.dll (Trojan.Agent)

C:\WINDOWS\system32\tdssl.dll (Trojan.Agent)

C:\WINDOWS\system32\tdssserf.dll (Trojan.Agent)

C:\WINDOWS\system32\tdssmain.dll (Trojan.Agent)

C:\WINDOWS\system32\tdssinit.dll (Trojan.Agent)

C:\WINDOWS\system32\tdsslog.dll (Trojan.Agent)

C:\WINDOWS\system32\tdssservers.dat (Trojan.Agent)

C:\WINDOWS\system32\drivers\tdssserv.sys (Trojan.Agent)

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1) Try to check your connections. Follow the guide from Microsoft, here: http://support.microsoft.com/kb/314067

2) You could try reseting your TCP/IP stack. Try this:

1. To open a command prompt, click Start and then click Run. Copy and paste (or type) the following command in the Open box and then press ENTER: cmd
2. At the command prompt, copy and paste (or type) the following command and then press ENTER: netsh int ip reset c:\resetlog.txtNote If you do not want to specify a directory path for the log file, use the following command: netsh int ip reset resetlog.txt

When you run the reset command, it rewrites two registry keys that are used by TCP/IP. This has the same result as removing and reinstalling the protocol. The reset command rewrites the following two registry keys: SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\
SYSTEM\CurrentControlSet\Services\DHCP\Parameters\

Do you know how to access your router's setup page? If yes then setup the MTU on your router, for DSL use 1492, for Cable use 1500/1400/1300 (try which one will be best for you). If this may not work you may want to directly connect your computer to the modem and test if the connection there is stable.

If you do not know how to access the router's setup page, please provide me this information,what is the model number of the router and the operating system of your computer. Is your computer wired or wireless? is there a wired computer?