Please follow the below steps.
1. Update System BIOS.
There is a BIOS update released for your machine specifically to add "Windows 8" support. Get it from Driver Details | Dell US
2. There is a large number of outdated drivers in the system which are not compatible with "Windows 8".
qicflt.sys Fri Jul 2 07:16:34 2010 (4C2D44FA)
QicFilterDriver-64Bits from Quanta Computer/Dell Webcam Driver
SynTP.sys Fri Sep 24 05:19:07 2010 (4C9BE773)
Synaptic Touch Pad Driver
HECIx64.sys Wed Oct 20 05:03:43 2010 (4CBE2AD7)
Intel Management Engine Interface
TurboB.sys Tue Nov 30 04:32:31 2010 (4CF43107)
Intel Turbo Boost driver
iaStor.sys Thu Jan 13 07:20:12 2011 (4D2E5A54)
Intel Storage drivers
RTKVHD64.sys Fri Feb 18 15:25:19 2011 (4D5E4207)
Realtek High Definition Audio Function Driver
nvBridge.kmd Fri Apr 22 06:31:09 2011 (4DB0D355)
nVidia Compatible Vista Kernel Mode Driver (likely belongs to nForce chipset drivers)
Accelern.sys Mon Dec 13 23:03:51 2010 (4D0658FF)
ST MicroElectronics Accelerometer
Please uninstall currently installed versions of these drivers completely from the system and download the "Windows 8" compatible drivers from the below link.
Drivers & Downloads | Dell US
Make sure to update all the drivers i listed.