Will it be a good idea uninstalling
windows vista and installing XP
in my humble opinion, this would be an excellent idea indeed (unless you intend to run applications that specifically require Windows Vista or you love Aero so much that you can't do without, that is).
i read couple of articles that
installing xp after uninstalling a
vista is a nightmare
there is nothing nightmarish about installing XP, your BIOS will allow you to change the SATA mode from AHCI to IDE (if necessary), Dell support offers all Windows XP drivers you need for the Dell Inspiron 1520.
make sure to backup your data first and download all the drivers from the Dell support website. insert you Windows XP CDROM, press F12 during the post screen (Dell Logo), boot from Onboard CD (if you receive a BSOD, go into the BIOS first and change the SATA mode from AHCI to IDE). in Windows setup, delete ALL existing partitions, setup the drive to your likings (i recommend at least 2 partitions, the first for the operating system and software, the second for storage) and install windows XP.