Tried installing both windows xp 32 bit and x64 versions on dell studio xps 435 midtower . both installation were without issues but had to upgrade some drivers for better results. The drivers that needed updating and the links are given below
for 32bit xp
1)ethernet driver for Intel(R) 82567LF-2
download2)intel chipset drivers goto the download link and select the latest INF Update Utility - Primarily for Intel® 5, 4, 3, 900 Series Chipsets
download3)smbus driver(seems to be needed only in 32bit while in 64bit intel inf utility does it all) from dell -- just run the downloaded exe so it will extract the files to a dell folder in c drive, dont install it as intel inf utility had already installed the latest drivers except the smbus driver. look in device manager for a smbus line and select update driver and slect the dell folder.
download4)dell bluetooth driver - download the attached file and run it , files will get extacted to c:/dell but will fail to install -- so install it manually as above by updating driver of bluetooth device from device manager
download5)select your monitor driver accordingly
download6)display driver - mine being ati radeon 4850 got it from amd site
download7)audio get it from realtek site
downloadfor 64bit xp
1)ethernet driver for Intel(R) 82567LF-2
download2)intel chipset drivers goto the download link and select the latest INF Update Utility - Primarily for Intel® 5, 4, 3, 900 Series Chipsets
download3)dell bluetooth driver - download the attached file and run it , files will get extacted to c:/dell but will fail to install -- so install it manually as above by updating driver of bluetooth device from device manager
download4)select your monitor driver accordingly
download5)display driver - mine being ati radeon 4850 got it from amd site
download6)audio get it from realtek site
downloadafter installation easybcd can be used to reinstall vista/7 bootloader so you can boot to vista/7/xp as needed