Here are some more information for Port Windows:

Windows Sound Drivers

The WaveRT port driver for Windows has a new interface that allows Windows Vista audio streaming technology.  The WaveRT driver supports audio devices that can connect to a system bus, and can play back and or record wave data.

Windows Vista picks up where XP left off.  Vista has the PortCls system driver, which provides a WaveRT port driver that gives the user real time performance, but instead uses a modified and simplified cyclic buffer for rendering or capturing audio stream.  The WaveRT port driver also provides the generic system functionality for kernel streaming filter that represents the audio device like those in previous Windows versions such as Windows Server 2003 and Windows XP.

The miniports in Windows Vista now use the WaveRT port driver as the preferred wave port driver.  It still supports WaveCyclic and WavePci miniport drivers.

By reducing the latency of audio streams, the WaveRT port driver uses real time scheduling support to deliver clear and quality sound.  Low latency isochronous transfer modes of PCI Express devices are more hardware innovations that Vista brings along to complement the additional real time scheduling

Considering these advancements, the audio device should be able to play and or capture input data with little or no involvement from the driver software.  The hardware for the audio device should also not need any assistance from the driver from the time run state to the exit state.  If all is correct, the result is a low latency audio that takes up few host CPU cycles and timing glitches are non existent. 

The WaveRT port driver uses a global audio engine.  With the global audio engine, the driver is able to mix the playback streams from the currently running audio applications.  It is also able to write the mixed stream into the cyclic buffer.  After mixed, the device takes the stream from the buffer and plays it.

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How can I restore a USB printer port in windows xp?

It appears that a trojan horse has destroyed the USB printer port and this particular printer does not have a parallel port option.

ok first did you remove all trojans ad viruses from the pc ? reinstall the drivers that came with the unit, if it is a hp or dell they have a pc help and tool folder in all programs , it has a restore drivers option. if that doesn't work you may need to reformat the drive reinstalling all. it is doubtfull the usb port itself is bad just cannot be seen or used right now. get norton system works and update regulary to prevent this in future. mine caught it yesterday and stopped it dead. you can try to go to manage hardware and delete the usb drive completely then reboot. it may see it and reinstall it. If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:
How to disable or enable Windows Me System Restore
How to turn off or turn on Windows XP System Restore

Note: When you are completely finished with the removal procedure and are satisfied that the threat has been removed, reenable System Restore by following the instructions in the aforementioned documents.

For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article: Antivirus Tools Cannot Clean Infected Files in the _Restore Folder (Article ID: Q263455).

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