Try this
Download and install Dr. TCP(hxxp://www.dslreports.com/front/drtcp.html). Run the program and use the following info.
Select your network card (the one that's attached to your cable modem) under "Adapter Settings".
Enter these values:
1. TCP Receive Window ---->32767 (all versions of Windows)
2. Windows Scaling ---> No (all versions of Windows)
3. Time Stamping ---> No (all versions of Windows)
4. Selective Acks ---> Yes *(all versions of Windows 'cept for 95/NT--this should be N/A)*
5. Path MTU Discovery ---> Yes (all versions of Windows 'cept '95--this is N/A for '95)
6. Black Hole Detection --> No (all versions of Windows)
7. Max Duplicate Acks --> 3 (Note: *this value should be 2 for Windows 2000 users and is N/A for Windows 95*)
8. TTL --> 64 (I'm impatient and don't like to wait around; if you wish you can use the default of 128 . . . anything more than 64 hops to me isn't worth it)
9. MaxMTU-->1500 (MaxMTU is the largest sized, unfragmented packet you can send and receive through your gateway.
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