What are the PC requirements for installing ModemSpeedBooster?
Why do I get the message "Registration Code Does Not
Exist" when I enter my Registration code?
How do I uninstall ModemSpeedBooster?
I’m seeing an error message and the program will not
The Program worked initially, but no longer works. An error
message may or may not appear when it is started.
What does ModemSpeedBooster optimize to improve my internet connection
How does ModemSpeedBooster’s Memory Optimizer work?
What are the PC requirements for installing
• Windows 95, 98, Me, NT4, or 2000.
• Pentium 66 or higher
• 32MB RAM recommended.
• Internet Connection: 14.4, 28.8, 56K, ISDN, xDSL, Cable, AOL,
Satellite, WebTV, T1, T3, OCx
For free Internet Explorer updates please visit:
Why do I get the message "Registration
Code Does Not Exist" when I enter my Registration code?
This can happen if you are entering an invalid code. It can also happen
if you mis-type the code (many users confuse the 1 and i when typing).
The best solution is to cut and paste the code field by field into the
registration text field so as to avoid typing errors.
How do I uninstall?
Uninstallation can be performed from 2 locations. In the Start menu,
under Programs, find the program's start menu entry, then click the "Uninstall"
icon. Also, you may uninstall by opening the Windows Control Panel and
choosing "Add/Remove Programs." In the Add/Remove programs list,
select the name of the program and choose "Remove." If the program
is running at the time you attempt to remove it, you will be required
to reboot your PC to complete the uninstallation.
I’m seeing an error message and
the program will not start.
ModemSpeedBooster installer does an excellent job of installing the necessary
run time files, however, it is also dependent upon parts of Windows as
well as files included in Internet Explorer. If you cannot start the program,
update your browser and your Windows operating system to include the latest
Service Pack. This can be done for free at
By updating your browser and operating system, you can make sure that
1-you have the latest technology, and 2-any files that have been corrupted,
deleted, unregistered, or moved will likely be replaced.
The Program worked initially, but no longer
works. An error message may or may not appear when it is started.
It is likely that an unrelated program that used shared files that the
privacy suite also uses was uninstalled, and that this program removed
the shared files when it was uninstalled. To fix this type of problem,
first try reinstalling. If this does not succeed, Uninstall (see How do
I uninstall) then re-download the software and reinstall again.
What does ModemSpeedBooster optimize to
improve my internet connection performance?
The following is a partial list of Windows Registry settings that ModemSpeedBooster
optimizes and their definitions:
MTU: (Maximum Transmission Unit) Is the greatest amount of data that can
be transferred in one physical frame on the network. If a packet that
has a smaller MTU than the packet's frame length is sent, fragmentation
will occur. For Ethernet, 1500 is the maximum MTU. The unofficial MTU
for SLIP servers is 1006.
MSS: (Maximum Segment Size) Defines the largest segment of TCP data that
the Winsock is prepared to receive. When a connection is established,
the two ends agree to use the smaller of each end's value. Windows calculates
MSS automatically, based on MaxMTU.
DefaultRcvWindow: (TCP Receive Window, or simply RWIN) Determines
how much data the receiving computer is prepared to get. A too large RWIN
will result in greater loss of data if a packet is lost or damaged. A
too small RWIN will be very slow, as each packet will have to be acknowledged
before the next packet is sent. The RWIN is set to a multiple of the TCP
Tcp1323Opts: Large window support. Used when an application requests
a Winsock socket to use buffer sizes greater than 64K. In previous implementations
the TCP window size was limited to 64K, this limit is raised to 2**30
through the use of TCP large window support as implemented in Winsock
SackOpts:Selective acknowledgements allow TCP to recover from IP packet
loss without resending packets that were already received by the receiver.
Employed with TCP large windows.
MaxDupAcks: Fast Retransmission and Fast Recovery of TCP connections that
are encountering IP packet loss in the network. Allow a TCP sender to
quickly infer a single packet loss by reception of duplicate acknowledgements
for a previously sent and acknowledged TCP/IP packet. This mechanism is
useful when the network is intermittently congested. The reception of
3 successive duplicate acknowledgements indicates to the TCP sender that
it can resend the last unacknowledged TCP/IP packet (fast retransmit)
and not go into TCP slow start due to a single packet loss (fast recovery).
DefaultTTL: Specifies the default Time To Live value
set in the header of outgoing IP packets. The TTL determines the maximum
amount of time an IP packet can live in the network without reaching its
destination. It is effectively a limit on the number of routers an IP
packet may pass through before being discarded.
PMTUDiscovery: Determines whether TCP uses a fixed, default
maximum transmission unit (MTU) or attempts to find the actual MTU. The
value of this entry is 0, therefore TCP uses an MTU of 576 bytes for all
connections to computers outside of the local subnet.
PMTUBlackHoleDetect: When enabled, causes TCP to try
to detect "Black Hole" routers while doing Path MTU Discovery.
Enabling black hole detection increases the maximum number of retransmissions
performed for a given segment.
How does ModemSpeedBooster’s Memory
ModemSpeedBooster’s Memory Optimizer proactively monitors your
system's level of available RAM to provide the best possible environment
for your PC to run in. Using its advanced RAMFlow system, it tracks your
free memory and automatically manages your RAM to prevent crashes and
boost PC performance. If you are a novice user, you can just install the
Memory Optimizer and enjoy fast automatic memory management and cache
tuning. If you are an advanced user, you can configure "Target"
and "Trigger" levels of RAM to free up the desired amount of
memory. Memory Optimizer also allows you to view all running applications,
even hidden ones, and how much RAM they use. You can set the CPU priority
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