Yes,You can Install Windows 7 in your pc
Like in my laptop
it is a HP Ze4900 laptop.
At first i find the drivers for the Wifi.
So if you downloaded the drivers for the wifi.
You can download the sound drivers.
NOTE:
I Downloaded The Vista Version of the Wifi.
I Don't know what happened.
But the driver works!
I afraid that your Hp pavilion may allow you to install windows 7 but it will be dead slow to use! better stick with XP! You can upgrade to sp3!