|I find absolutely nothing useful when I search on the web with: Pryon E7300xpp|
The only thing I can tell from that after looking at the meagre Pyron systems info on the web is it probably has an Intel E7300 cpu, and it may have been assembled and sold in 2009.
It's likely your system has a retail mboard model, which may or may not have a Pryon bios version on it.
The model, sometimes the make, of a retail mboard model is usually printed on the mboard's surface in obvious larger characters, often between the slots.
If you see that, tell us what it is.
Then we can point you to where to get the drivers.
Download this and run it. It will identify the hardware on your computer, and with that info you can search for drivers:
SIW - System Information for Windows