I recently bought a philips x57 notebook pc running windows vista ultimate. As most of my games did not work on vista I decided to install xp home on my usb hard drive. I installed it onto my western digital passport 60gb and I could only boot into xp home and not vista. I think I have changed the master boot record. As I bought it from PC World the support was provided by the techguys I could not get into the hd based recovery program. Me stupidly had not created a dvd recovery disc with the reocvery media creator so i was stuck. I installed an oem copy of xp on my main hard drive deleting all my data by formatting it which I did on purpose which I hoped would fix the problem and it did but i had to get xp drivers for my laptop. I used the vista driver disc for bluetooth,mouse e.t.c. The only ones I cannot install are conexant high definition audio and nvidia geforce go 7400. I have looked for unofficial ones, gone on the hp website and they say 'Cannot find the MEDIA device for this driver'. and on the nvidia one it says 'Cannot find any drivers for your hardware'. These drivers I have just described are designed for windows xp. I think for the graphics driver I may need to get the chipset driver/gma driver. Perhaps for the audio driver there is Microsoft UAA High Definition Bus Driver but I have looked and you have to send off for. If anyone has already got it can you send it to me, thanks
In Device Manager (Control Panel>System & Hardware Tab) do you have any Yellow Exclamation Marks? If so, right click the device and select properties. Make a note of the device name. Close properties right click the device again and select remove. Reboot the system and Windows may try to find the correct driver.
If that doesn`t make any difference try looking for the correct driver from the device manufacturer.
By the way, from my first link, have you downloaded and installed the Intel chipset drivers? That might explain why you can`t see the devices. Post back as you go along. I may be away for a while but someone will offer some other advice.