Also, it may well pay to make sure XP is updated to SP3 at the earliest opportunity .. as Service Pack2/3 add lots of drivers and support for later devices.
If you add Service packs this will cut down on the Windows updates you require. Being Dell, I would assume that is not an Athlon processor .. If it was, you need to add the AMD patch before updating to SP3.
Flash BIOS if you're brave .. after installing motherboard drivers and before anything else .. in case it fails.