Hello,
I am running Windows XP Pro SP2 with SBC DSL 512k download speed but i am getting slow speeds. i have installed the p2p fix. here is the test data:

 Browser/OS = Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1. Gecko/20051111 Firefox/1.5
Notes: Read the Analyzer FAQ if the above is not your IP address.
TCP options string = 020405ac01010402
MTU = 1492
MTU is optimized for PPoE DSL broadband. If not, consider raising MTU to 1500 for optimal throughput.
MSS = 1452
MSS is optimized for PPPoE DSL broadband. If not, consider raising your MTU value.
Default Receive Window (RWIN) = 65535
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 65535

Note: TCP 1323 Options need to be enabled for RWIN over 2^16 (65535). Windows 9x might also need the MS Vtcp386 fix.
For optimum performance, consider changing RWIN to a multiple of MSS.
Other values for RWIN that might work well with your current MTU/MSS:
511104 (MSS x 44 * scale factor of
255552 (MSS x 44 * scale factor of 4)
127776 (MSS x 44 * scale factor of 2)
 63888 (MSS x 44)
bandwidth * delay product (Note this is not a speed test):

Your RcvWindow limits you to: 2621.4 Kbps (327.675 KBytes/s) @ 200ms
Your RcvWindow limits you to: 1048.56 Kbps (131.07 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 118 hops

TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000 (0)

::::::::::.. Download Stats ..::::::::::
Connection is:: 1314 Kbps about 1.3 Mbps (tested with 1496 kB)
Download Speed is:: 160 kB/s
Tested From:: http://testmy.net (server2)
Test Time:: Tue Jan 17 2006 16:29:49 GMT-0600 (Central Standard Time)
Bottom Line:: 23X faster than 56K 1MB download in 6.4 sec
Diagnosis: May need help : running at only 50.77 % of your hosts average (swbell.net)
Validation Link:: http://testmy.net/stats/id-ATSF3JQRW

::::::::::.. Upload Stats ..::::::::::
Connection is:: 335 Kbps about 0.3 Mbps (tested with 579 kB)
Upload Speed is:: 41 kB/s
Tested From:: http://testmy.net (server1)
Test Time:: Tue Jan 17 2006 16:30:53 GMT-0600 (Central Standard Time)
Bottom Line:: 6X faster than 56K 1MB upload in 24.98 sec
Diagnosis: 90% + Okay : running at 97.67 % of your hosts average (swbell.net)
Validation Link:: http://testmy.net/stats/id-1MDH2KNIS

Checking for Middleboxes . . . . . . . . . . . . . . . . . .  Done
running 10s outbound test (client to server) . . . . . 329.09kB/s
running 10s inbound test (server to client) . . . . . . 1.30Mb/s
Your PC is connected to a Cable/DSL modem
Information: Other network traffic is congesting the link

i think that my dl speed is 512k but i don't know my upload speed.  here are the results:

The current date is: Tue 01/17/2006
The current time is: 17:12:12.95

Microsoft Windows XP [Version 5.1.2600]


Pinging testmy.net [67.18.179.85] with 32 bytes of data:



Reply from 67.18.179.85: bytes=32 time=28ms TTL=50

Reply from 67.18.179.85: bytes=32 time=28ms TTL=50

Reply from 67.18.179.85: bytes=32 time=28ms TTL=50

Reply from 67.18.179.85: bytes=32 time=28ms TTL=50



Ping statistics for 67.18.179.85:

    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

    Minimum = 28ms, Maximum = 28ms, Average = 28ms

 
Ping Complete.
 
 


Tracing route to testmy.net [67.18.179.85]

over a maximum of 30 hops:



  1     1 ms     1 ms     1 ms  192.168.0.5

  2    10 ms     9 ms    10 ms  adsl-68-92-123-254.dsl.spfdmo.swbell.net [68.92.123.254]

  3    10 ms    10 ms    10 ms  dist1-vlan60.spfdmo.sbcglobal.net [151.164.88.162]

  4    10 ms    10 ms    10 ms  bb1-g2-3-0.spfdmo.sbcglobal.net [151.164.88.241]

  5    27 ms    27 ms    27 ms  bb1-p11-3.rcsntx.sbcglobal.net [151.164.41.198]

  6    30 ms    27 ms    26 ms  bb2-p4-1.rcsntx.sbcglobal.net [151.164.191.122]

  7    28 ms    29 ms    28 ms  ex1-p12-0.eqdltx.sbcglobal.net [151.164.40.29]

  8    27 ms    31 ms    28 ms  151.164.249.222

  9    28 ms    29 ms    29 ms  208.175.175.42

 10    28 ms    28 ms    27 ms  vl32.dsr02.dllstx3.theplanet.com [70.85.127.62]

 11    29 ms    28 ms    28 ms  vl41.dsr01.dllstx4.theplanet.com [70.85.127.83]

 12    29 ms    29 ms    28 ms  gi1-0-2.car17.dllstx4.theplanet.com [67.18.116.85]

 13    29 ms    29 ms    28 ms  85.67-18-179.reverse.theplanet.com [67.18.179.85]



Trace complete.

Ping and trace look good.  I would agree with Gib4500 in that you are likely on the 1.5M package, judging from your speed tests.

You can look into tweaking your OS using a program called Cablenut.  Read HERE