Hi Valentina,
Frankly I am not surprised that you are having these problems :-/. I have talked to a lot of people who had problems with Vista and elected to downgrade to XP like you did. It also has had a lot of bad publicity in the press.
As a disclaimer, I cannot offer good advice based on my own practical experience, since I have sidestepped these problems by migrating to mac platform in around 2006. I used to use windows for a long time (all the way back to DOS), but I had enough and did the jump to Mac and have never looked back.
Regarding the drivers question, check the dell website (click support) and search for the model and see if they have drivers for Windows XP. I did a quick search for "XPS M1330" on the Australian dell site, and did not find any XP drivers, but I recommend you to try it.
Firstly, have you tried wiping (after backing your data of course), and reinstalling the OS from your recovery disk that came with your notebook? Did your computer crash every five minutes when you first bought it? If not, wiping everything and reinstalling can solve the problem.
You mentioned that you bought your computer in Jan 2008. Is your computer under warrenty/support? The reason I am asking is that you might be able to call Dell support and tell them of the crashing problems, perhaps they can help by showing you how to install the latest patches and service packs. Maybe you can ask them if they have an option for you to downgrade the OS (though that is a long shot).
You can also ask them if the Office that came with your notebook will work with Windows XP. Office 2007 works with Windows XP usually, but I am not sure if your copy has been limited because it can bundled with your notebook. It does not hurt to double check.
To go back to windows XP, you need to get your hands on an Windows XP installation disk. My understanding is that don't think they sell licenses for them anymore (except with cheap netbooks), because Microsoft wanted everyone to move to Vista.
Something that might help, is your are working for a large company, they may have a site licence for all their employees, and they might be able to supply you with a copy of XP for your notebook. Its a long shot, but worth a try.
Cheers,
Angelos
angelos, Aug 5, 2009 @ 16:13