Media device not available

hello sir.
I hav compaq presario v2000
I am not able to install multimedia audio driver on my windows xp
I tried conexant audio driver
I read before conexant I have to install universal aa bus
driver, I installed it too
but again when I install audio driver it shows media device not available
now again I format my laptop
but on device manager yellow ? at multimedia audio controller and pci modem

please suggest me