overclock an intel celeron

Hello, i would like to know if its possible to overclock my pc. And with what program. Thanks
Here are the specs:

Field Value
CPU Properties
CPU Type Intel Celeron
CPU Alias Northwood-128
CPU Stepping D1
Engineering Sample No
CPUID CPU Name Intel(R) Celeron(R) CPU 2.50GHz
CPUID Revision 00000F29h

CPU Speed
CPU Clock 2496.5 MHz (original: [ TRIAL VERSION ] MHz)
CPU Multiplier 25x
CPU FSB 99.9 MHz (original: 100 MHz)
Memory Bus 133.1 MHz
DRAM:FSB Ratio 4:3

CPU Cache
L1 Trace Cache 12K Instructions
L1 Data Cache [ TRIAL VERSION ]
L2 Cache 128 KB (On-Die, ECC, ATC, Full-Speed)

Chipset Properties
Motherboard Chipset Intel Brookdale-G i845GEV
Memory Timings 2.5-3-3-7 (CL-RCD-RP-RAS)

BIOS Properties
System BIOS Date 06/01/04
Video BIOS Date 04/16/03
DMI BIOS Version P3.00

Graphics Processor Properties
Video Adapter Intel 82845G/GL/GV Graphics Controller
GPU Code Name Brookdale-G (Gen2) (Integrated 8086 / 2562, Rev 03)
GPU Clock 200 MHz

Chipset
Field Value
North Bridge Properties
North Bridge Intel Brookdale-G i845GEV
Maximum Memory Amount 2 GB
Revision 03
Package Type 760 Pin FC-BGA
Package Size 37.5 mm x 37.5 mm
Core Voltage 1.5 V
In-Order Queue Depth 12

Memory Timings
CAS Latency (CL) 2.5T
RAS To CAS Delay (tRCD) 3T
RAS Precharge (tRP) 3T
RAS Active Time (tRAS) 7T
Refresh Period (tREF) 7.8 us
DRAM Idle Timer 16T

Error Correction
ECC Not Supported
ChipKill ECC Not Supported
RAID Not Supported
ECC Scrubbing Not Supported

Memory Slots
DRAM Slot #1 1 GB (DDR SDRAM)
DRAM Slot #2 256 MB (DDR SDRAM)

Integrated Graphics Controller
Graphics Controller Type Intel Extreme Graphics
Graphics Controller Status Enabled
Shared Memory Size 8 MB

Field Value
Motherboard Properties
Motherboard ID 62-P300-001368-00101111-040201-INTEL$I45G300_P4I45GV BIOS P3.00
Motherboard Name ASRock P4i45GL/GV/PE

Front Side Bus Properties
Bus Type Intel GTL+
Bus Width 64-bit
Real Clock 100 MHz (QDR)
Effective Clock 400 MHz
Bandwidth 3200 MB/s

Memory Bus Properties
Bus Type DDR SDRAM
Bus Width 64-bit
DRAM:FSB Ratio 4:3
Real Clock 133 MHz (DDR)
Effective Clock 267 MHz
Bandwidth [ TRIAL VERSION ] MB/s

Chipset Bus Properties
Bus Type Intel Hub Interface
Bus Width 8-bit
Real Clock 67 MHz (QDR)
Effective Clock 267 MHz
Bandwidth 267 MB/s