Disagree with brooksy - a new system is a happy system ... a repaired system is an accident waiting to happen (should only be used if you absolutely have no other option.
the basic rule is if the PC was out BEFORE the operating system - the drivers are probably included on the XP CD
after ... you need those drivers (what came with the machine?)
if you don't have drivers on disc
download the latest versions them from
http://support.packardbell.com/uk/item/index.p hp?pn=PB85Q01201&g=2000
burn them to cd (this is the best option ... drivers are updated for a reason ... the latest tends to be the bestest)
boot from the XP CD and delete the system partition
then install xp
once running ... install the drivers .... install your progs
allow about 1 - 1.5 days (longer if this is your first)