#1) What BIOS are you running Rlyss? I see that the latest is Dell Inspiron 5160 System BIOS, A07.
#2) Have you also installed the Intel Chipset drivers and the Microsoft Mobile Pentium 4 drivers from the Dell website?
#3) Have you tried reloading Windows XP on the laptop? If it's the stock install from Dell, I would recommend this anyway. Just start fresh from the XP cd they gave you and don't install all of the extra crap that comes with the computer. I know you said the laptop is only 2 weeks old, but when I got my Latitude D8100, the first thing I did was wipe the hdd and reinstall.
The support site for the 5160 is at
http://support.dell.com/support/down...&os=WW1&osl=EN