More than 300 products contain the term "Presario 2500" on the HP website. You need to look at the tag on the bottom of the pc and obtain the exact model number.... 2500 is only a series name/number. When you determine the model number, go to the link below and type it into the search box:
Or Open Device Manager, find and double-click the network device, click the Details tab, select "hardware id" and give me the hardware id string that begins with "PCI\VEN", (1st./top line of text only).
You didn't say if it's a LAN or WLAN device. Nor did you offer any hardware specific information. That makes it difficult to help.