install winxp on asus aspire 5920g notebook

You will not run XP reliably on this hardware.
The chances are - even if you can get compatible,generic sound and network drivers - you are more or less not going to be able to find stable chipset drivers.
New hardware is being geared toward Vista - to run Windows in a stable state - you are going to have to use Vista.

Use Everest to find compatible drivers:
http://www.lavalys.com/products/overview.php?pid=3&ps=UE&lang=en

Or - utilise msinfo32 and device manager's Hardware Id's with www.pcidatabase.com to find compatible drivers.

"you are more or less not going to be able to find stable chipset drivers..."

Can you please explain that?

A "chipset driver" is not a single driver - it is a package of multiple inf, sys and associated files that provide basic support for the computer.
I.e. they provide optimized conditions for data transfers between CPU, memory and hard disk and proper ACPI support (i.e. power options in windows), amongst other things.

Without these - especially on most laptops - the sound will not work anyway.
The LAN and WLAN might not work either - depending on the chipset.

If you run XP on this hardware - that has been designed for XP - you risk constant issues - such as slow performance, less-than-optimal graphics support - and a multitude of other annoyances.
With adequate training - Windows Vista can become as easy - or easier - to use than XP.

It's not matter of how easy or not vista is, for me.
I think that it can make my laptop slower.
I have a good desktop pc with both systems on and I'm familiar with vista.

With this new laptop that I bought I just think it would be faster and more simple with xp on.

As long as I know you can have either system on a dektop pc, but about laptops, I have no experience at all.

If you are sure it's better to leave to vista on my asus 5920 and if I install xp and would make it slower or with problems at the end,  I'll follow your advice and I'll leave it as it is.

If you really want XP on the unit, before you do anything else, download, install, and run System Information for Windows, (SIW) from

http://www.gtopala.com/siw-download.html

After it's run, click File | Create Report.

 Upload the report to http://www.ee-stuff.com

Use your Experts Exchange username and password to log in there. Due to the large file size DO NOT copy the log to this thread.

Once we know exactly what the hardware is, finding the drivers is easier. It's your laptop, so your call what OS you may want on it. Some manufacturers are getting keen to the idea that users don't want Vista and are making it easier for their customers to downgrade to XP. Unfortunately, the unit you have isn't one of the lucky ones that way, so if you really want XP, it'll take a harder route to get there. Probably not impossible, but some work.

Thanks - souseran's method would take a lot of effort - and you probably wouldn't end up with fully-functional hardware...

A lot of effort, agreed. The primary reason for lack of hardware functionality is that the manufacturers want to sell Vista. Ingenious geeks get this kind of downgrade to work with regularity. It's just a question of whether one wants or needs to go to the effort required. In some settings, for example with legacy applications which may not be able to run on Vista and might cost a substantial amount to replace, such downgrades are completely worth the time invested. For an average person who surfs the web, uses email, and a suite for word processing and spreadsheets, it's a personal judgment call.

>> "...with legacy applications which may not be able to run on Vista and might cost a substantial amount to replace..."

Surely - using virtualization would be a better idea? Rather than risking the stability of all your Vista compatible apps, with poor driver support, and potentially frequent driver-related issues - using Virtual PC or VMware would be a more suitable alternative.