Then the only way I know of is to find a hacked BIOS that does.
But overclocking that machine won't gain you much anyways. The primary bottlenecks people have in computers these days are hard drive speeds and shared bandwidth USB speeds.
If your looking for some gaming speed, put a proper video card in your system. The one you have is for economy computers that spend most of their time in MS office. If money is an issue, find yourself a GTX 660, this is nVidia's economy performance line.
If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.
How Do I Overclock a Pentium D 2.8ghtz Smithfield Build socket 775 cpu
CPU Arch : 1 CPU - 2 Cores - 2 Threads
CPU PSN : Intel Pentium D CPU 2.80GHz
CPU EXT : MMX, SSE (1, 2, 3), EM64T
CPUID : F.4.7 / Extended : F.4
CPU Cache : L1 : 2 x 12 / 2 x 16 KB - L2 : 2 x 1024 KB
Core : SmithField (90 nm) / Stepping : B0
Freq : 2801.17 MHz (200.08 * 14)
MB Brand : Asus
MB Model : LEONITE
NB : Intel i945P/PL/G/GZ rev A2
SB : Intel 82801GB (ICH7/R) rev A1
GPU Type : NVIDIA GeForce GT 610
GPU Clocks : Core 810 MHz / RAM 500 MHz
DirectX Version : 11.0
RAM : 4096 MB DDR2 Dual Channel
RAM Speed : 333.5 MHz (3:5) @ 5-5-5-15
Slot 1 : 2048MB (6400)
Slot 1 Manufacturer : OCZ
Slot 2 : 2048MB (6400)
Slot 2 Manufacturer : OCZ