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I just found this on the Microsoft board. Since I had similiar problems with the Sny trv330, I thought It might help:
SYMPTOMS
After you update your computer to Microsoft Windows XP Service Pack 2 (SP2), the performance of your 1394a or 1394b FireWire devices may be greatly decreased. A digital camera that uses S400 speed is an example of such a device.
CAUSE
This problem occurs if you connect a 1394a or 1394b FireWire device to a 1394b port. This problem occurs because Windows XP SP2 changes 1394b ports to S100 speed when you upgrade
read more at:
http://support.microsoft.com/kb/885222
The article gives a registry fix if you have this problem, with a download repair. here is the link to that download
http://www.microsoft.com/downloads/details.aspx?FamilyId=CA0F2007-18B5-4112-8BD6-8BF4BD3130B9&displaylang=en
Of Course, DO NOT download and install anything you do not understand, or if you are not having the problem.
hope it helps.
I read the article, and downloaded the patch (good thing I have a genuine Windows Install).
[KB885222.log]
4.265: ================================================================================
4.265: 2005/12/16 21:41:14.638 (local)
4.265: c:\bb8204125cd37a90f9536092\update\update.exe (version 6.1.22.4)
4.281: DoInstallation: GetProcAddress(InitializeCustomizationDLL) Returned: 0x7f
4.281: Hotfix started with following command line:
4.328: CreateUserInterface: GetProcAddress for DefineInstallCustomUI failed: 0x7f
4.359: DoInstallation: CustomizeCall Failed: 0xb7
4.375: Cannot create a file when that file already exists.
7.015: Message displayed to the user: Cannot create a file when that file already exists.
7.015: User Input: OK
7.015: KB885222 installation did not complete.
8.031: Message displayed to the user: KB885222 installation did not complete.
8.031: User Input: OK
8.031: Update.exe extended error code = 0xb7
8.031: Update.exe return code was masked to 0x643 for MSI custom action compliance.
It is not that it has decreased speed and so on, it will NOT connect at all unless it has the USB cable (which limits the use to memory stick only).