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ThanksTo! Jeremy Stiltz for the tip about this problem.

Some of the Registry settings that "speed tweak" or "MTU adjust" programs change can cause problems with your connection if they are not set properly.  Fixing this usually involves some Registry editing...

Standard Editing-the-Registry Warning!

Not knowing what you are doing and editing the Registry can be a very bad thing.  You won't cause the end of the Universe as we know it, but you could cause your computer to not boot, requiring the services of expensive highly-trained computer fix-it type people.  In the process of fixing your machine, they might accidently lose your data.

So, if you aren't comfortable doing this, don't.   Or at least back up your data first!

End of Warning!

There are a couple of ways to go:

Method 1 - Delete the Registry values manually Your best bet is to first try deleting the registry entries that change the values from their Microsoft-defined defaults. 

For Win95/98 
Navigate to this registry branch

HKEY_LOCAL_MACHINE\System\CurrentControlSet
\Services\VxD\MSTCP

and delete the "DefaultRcvWindow" entry.

For WinNT/2000
Navigate to this registry branch

HKEY_LOCAL_MACHINE\System\CurrentControlSet
\Services\Tcpip\Parameters

and delete the "TcpWindowSize" entry.

Other speed related Registry tweaks can be found over at speedguide.net.  They've got a good definitions page that will tell you what these terms mean, too!

Method 2 - Do it automatically

John Navas has a Visual Basic program that you can run under the Windows Scripting Host.  It provides not only an adjustable TCP Receive Window size, but also the ICS fix (see Q230116 "Slow Transfer Rates with ICS and High-Bandwidth Devices") and the ability to clean out any dial-up modem "tweaks" that might interfere with cable modem/DSL speed  Go to John's page to read more about it and download it.