PCI bus 0, device 31, function 3

SOURCE: need driver

you have to download the inf(chipset) drivers for sm bus and most probably the pci device is the sound or any other card in the pci slot check it then download accordingly

SOURCE: The PNP information

Try this for the audio

Direct download link - ftp://202.65.194.211/pc/audio/WDM_R201.zip

if that doesn't work try here
get the "Windows 2000, Windows XP/2003(32/64 bits) Driver only (Executable file)"

lets get these sorted one by one, so let me know if that gets your sound working.

SOURCE: I want to V2000 laptop driver.

First, Right click my computer, click manage, then go to device manager from the opened window. Then, right click on your 5 specified components, and click update driver. this should automatically try to update them online.
Failing that.... the following is the long winded way of doing things!
This site should do the trick. look at the exact model number on the bottom of the laptop, it should say;
HP Compaq Presario V20zzxx
[where zz is 2 numbers for the exact model number] [where xx is 2 letters in lower case]
(you'll see what i mean when you click the link) select the relevant link from here and click to download
http://h20000.www2.hp.com/bizsupport/TechSupport/ProductList.jsp?lang=en&cc=us&taskId=135&prodTypeId=321957&prodSeriesId=432985

SOURCE: driver missing

We had the same exact problem but with a Compaq Pesario V6000 series notebook. Ours had to do with the NVidia System Management Controller but was listed in the device manager as a coprocessor. Kind of a bland description.
Solution: Downloaded and installed NVidia System Management Controller from here. Hope this helps.