Hi Chrome4ever
As I am currently selling this very card I quickly tested it for you. Yes the card runs under Windows 11 with the standard driver from the manufacturer's site.
Greetings Jens
The PCI card does not need a separate driver installation.
Have you connected the power supply to the PCI card (power cable from the power supply unit to the PCI card)? This information is poorly/ unclearly described in the instructions.
Did you connect the card correctly and with a Molex cable from the power supply? Maybe try another slot or see if the DriverBooster software of IOBit finds current drivers.
Molex cable: https://sgcdn.startech.com/005329/media/products/gallery_large/LP4POWEXT12.C.jpg
Drivers for XP: http://www.via-labs.com/archive/doc/VIA_XHCI_Driver_V4.40E_AP.zip
IOBit DriverBooster: http://www.iobit.com/fr/driver-booster.php
Hi I didn't find much but you should look around here:
http://support.hp.com/us-en/product/HP-Pavilion-Elite-m9000-Desktop-PC-series/3824167/model/3886099/manuals
and maybe enter your model number to find confirmation if you have [from digitec specifications]:
Hardware interface i PCI-E x1
You can connect all kinds of USB devices that need an internal connection anyway, including a card reader, sound card panel, USB control of certain power supplies, etc.