Netacno.

http://support.microsoft.com/kb/329632

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USB 2.0 is a specification revision of the original USB 1.1 specification. USB 2.0 was approved April 2000. The corresponding EHCI specification was finished March 2002.

Windows XP did not include support for USB 2.0 technology for the following reasons:
•   There were no production quality EHCI 1.0 compatible host controllers.
•   There were not enough production-quality USB 2.0 devices for testing.

The Windows XP Service Pack 1 installer is designed to update all drivers and all files that are included with Windows XP.
Because USB 2.0 drivers are not included with Windows XP, you must follow the steps in this article to obtain the latest drivers after you install
Windows XP Service Pack 1.

Ima neka fora zašto moraju da se instaliraju, na SP1 znaju da prave probleme, a XP bez SP ih nema uopšte (govorim za 2.0).

Meni nikada nisu pravili problem a koristio sam sve verzije XP-a od ciste do SP3. Mozda izvesni drajveri za maticne ploce u sebi sadrze i USB drajvere za ranije verzije Wina. Zasebno ih nikad nisam instalirao.