I assume that you've tried the SiS Registry patch? I also assume that you've tried changing the SiS drivers to "Standard OPenHCI USB Host Controller?

If you've done those things or even if you have, try *unplugging all USB devices* and repairing XP:

http://www.michaelstevenstech.com/XPrepairinstall.htm

You should not plug any other USB device in until you've tried your new device.

You will have to re-install SP1, DX9, WMP9 and any other security patches afterward.

Bill

: : Please trim the details and tell us what the problem is. We know it's SiS and we know that ACPI is disabled.

: : Bill

: Excuse my long introduction and multiple post, but doing research for some days now, and reading your nice
: site as well as others and searching for dirvers, i thougt some details could help to track the issue down.

: Problem is my USB Flash Stick (USB2) is not beeing recognized by Windows XP allthough the manufaturer and all others of equivalent products state it to be unecessary to add any driver to the system. The PC-System OEM manufacturer did not know any solution. SiS does not seem to offer any updated USB driver. XP acknolages there was new hardware added and pops up the wizzard, but does not find an apropriate driver on disk, internet, or if manual selected does not present me any massstoragedriver/HDdriver/USBdevice.

: Other USB and USB2 devices like a DVD Player, CD Burner, and Multicardreader work fine.

: The Stick itself works fine on two other Win2k systems.

: I am not sure if ACPI is really OFF as the Computer is labeld ACPI-Uniprozessor-PC in the device manager and i did not install the OS myself.

: My Humble idea was that i could maybe adapt a driver from another manufacturer if someone could point me to one or to only tweak the regestry if i only knew how.

: Sory.... that was long again....