Couple of questions
Did the system ship with Windows XP?
If so, here are the drivers:
http://support.dell.com/support/down...&catid=&impid=
You must install the drivers in a specific order:
Desktop System Software
Chipset
Graphics
ect (The top three are the most important)
Make sure you have integrated audio (STAC 92XX C-Major HD Audio) and not an ad-on sound card)
If you reinstall Windows with the Dell Cd, you should not have problems. Other versions of Windows will require a RAID driver. The Dell CD has these included.
STeve