All of a sudden, none of my USB devices stopped working on Windows XP (SP1). I have 2 USB ports. I am not sure whether it is USB 1.1 or USB 2. Device manager shows that the USB hubs and controllers are working fine. I tried to download as many patches as I thought would be applicable to this problem from microsoft site, but no luck. Any suggestions? I can go step-by-step all over again to install the patches etc.

I assume you mean none of them are working. If they (not the USB hubs) appear in Device Manager, delete them and try reinstalling.

I'm with BurrWalnut. Sometimes the easiest fix is to delete everything related to USB, then reboot and let XP reinstall the drivers. Good luck.

SP1 strikes again, try this it worked for me Upgrading to USB 2.0 EHCI Host Controller If you have a computer that supports USB 2.0, and if you have a preinstalled USB 2.0 driver from the OEM, you continue to use the earlier preinstalled drivers for USB 2.0 even after you install SP1. To upgrade to the USB 2.0 enhanced host controller driver in Windows XP SP1, follow these steps: Make sure that Windows XP SP1 is installed, and that you have restarted your computer (if requested). For more information about Windows XP SP1, visit the following Microsoft Web site: Microsoft Windows XP http://www.microsoft.com/windowsxp/ Open Device Manager and view Devices by Type. To open Device Manager, either run devmgmt.msc from a command prompt, or follow these steps: Click Start, right-click My Computer, and then click Manage. Expand System Tools, click Device Manager, and then click Devices by type on the View menu. Right-click the USB 2.0 EHCI Host controller, and then click Update Driver. You can find the USB Host controller entry under either of the following locations: Universal Serial Bus Controllers. Other Devices, where it will be labeled as Universal Serial Bus controller with a yellow exclamation mark next to it. Click Install the software automatically (Recommended), and then click Next. Click Finish when installation is complete. You may be prompted to restart your computer to finish the installation. back to the top Confirming Driver Versions To confirm that you have the latest USB 2.0 drivers from Windows XP SP1, make sure that you have the following (or later) driver versions: Date Version File name 29-Aug-2002 5.1.2600.1106 Usbport.sys 29-Aug-2002 5.1.2600.1106 Usbhub.sys 29-Aug-2002 5.1.2600.1106 Hccoin.dll 29-Aug-2002 5.1.2600.1106 Usbehci.sys

What if I don't want to install SP1? What are my options?