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COM1/Universal Host Controllers conflict after Win XP upgrade

I just used the "Windows XP home edition" upgrade to upgrade from "98se". Since I did this, COM1 and the 2 Universal Host Controllers are conflicting. I now have no USB ports. I'm not using the COM1 for anything. I tried changing the IRQ from the properties window for COM1, but my choices are "Basic config 0000-0007", and that only switches between IRQ 3 & 4. IRQ 3 conflicts with COM2, and IRQ 4 conflicts with the 2 USB Universal Host Controllers. What happened, and can you please tell how to fix it?
You have a driver conflict. Go through Device Manager and delete/remove/uninstall every USB and COM port driver you see. Then when the system reboots and re-detects them, be sure to provide a path to the newest drivers from XP's CD. If that fails, perform another upgrade install. This may repair the issue as well. If that all fails. Use the Files and Settings Transfer Wizard to backup your data files and personal settings, then perform a clean install of XP and restore your data from the backup.

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