REALLy need help PC go slow motion

here my problem my pc seem to get very slow responding for no reason when i play pc game like tf2 sometime i got spike like hell i have to wait few sec and it went to normal, my gpy seem to be at 40 degree
all temp look good
i just change my cpu thinking it was too slow i have e5500 before
i try overclock not fixing i know ita not software related problem bucz i have this probleme long time before i have made ubgrade to my pc
so now i am wondering if there is a way to find out why the pc do that
is that the integrated sound card? or maybe harddrive that go wrong?
or ram?

all i know is that the drop in the pc playing is almost not possible
i get like spike like everything frozze a sec and come back

iSoftware Sandra

Computer
Model : System manufacturer System Product Name
Workgroup : WORKGROUP
Host Name : Desktop-PC
User : Yazmo

Processor
Model : Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz
Speed : 3.1GHz
Cores per Processor : 2 Unit(s)
Threads per Core : 1 Unit(s)
Type : Dual-Core
Integrated Data Cache : 2x 32kB, Synchronous, Write-Thru, 8-way, 64 byte line size
L2 On-board Cache : 6MB, ECC, Synchronous, ATC, 24-way, 64 byte line size, 2 threads sharing

Computer
Mainboard : Asus P5Q SE PLUS
BIOS : AMI 2204 08/28/2009
Bus(es) : ISA X-Bus PCI PCIe IMB USB i2c/SMBus
Multi-Processor (MP) Support : No
Multi-Processor Advanced PIC (APIC) : Yes
Total Memory : 4GB DIMM DDR2 DDR3

Chipset
Model : ASUS P45/P43/G45/G43 DRAM Controller
Front Side Bus Speed : 4x 345MHz (1.38GHz)
Total Memory : 4GB DIMM DDR2 DDR3
Channels : 2
Memory Bus Speed : 2x 414MHz (828MHz)

Memory Module(s)
Memory Module : Kingston 2GB DIMM DDR2 PC2-6400U DDR2-800 (5-5-5-18 3-23-6-3)
Memory Module : Kingston 2GB DIMM DDR2 PC2-6400U DDR2-800 (5-5-5-18 3-23-6-3)

Video System
Video Adapter : NVIDIA GeForce 9800 GT (112 SM4.0 1.55GHz, 512MB DDR3 2x912MHz, PCIe 2.00 x16)

Graphics Processor
OpenCL Processor : NVIDIA GeForce 9800 GT (112SP 14C 1.67GHz, 495.6MB 2x912MHz)
CUDA Processor : NVIDIA GeForce 9800 GT (112SP 14C 1.67GHz, 495.6MB 2x912MHz)
Compute Shader Processor : NVIDIA GeForce 9800 GT (112SP 1.55GHz, 495.6MB 2x912MHz)

Storage Devices
Seagate ST31000528AS (1TB, SATA300, 3.5", 7200rpm, NCQ) : 932GB (C (E (F
WDC WD5000AAKS-75A7B2 (500.1GB, SATA300, 3.5", 7200rpm, NCQ, 16MB Cache) : 466GB (D (G
HL-DT-ST DVDRAM GH22NS50 (SATA150, DVD+-RW, CD-RW, 2MB Cache) : N/A (H
FAFULE L2ZSTEFGT (SCSI, BD-R, HD-DVD-R, DVD+-R-DL, CD-R) : N/A (I
FAFULE L2ZSTEFGT (SCSI, BD-R, HD-DVD-R, DVD+-R-DL, CD-R) : N/A (J

Logical Storage Devices
Windows (C : 195GB (NTFS) @ Seagate ST31000528AS (1TB, SATA300, 3.5", 7200rpm, NCQ)
Stuffs (D : 319GB (NTFS) @ WDC WD5000AAKS-75A7B2 (500.1GB, SATA300, 3.5", 7200rpm, NCQ, 16MB Cache)
Downloads (E : 293GB (NTFS) @ Seagate ST31000528AS (1TB, SATA300, 3.5", 7200rpm, NCQ)
Games (F : 443GB (NTFS) @ Seagate ST31000528AS (1TB, SATA300, 3.5", 7200rpm, NCQ)
Hard Disk (G : 146GB (NTFS) @ WDC WD5000AAKS-75A7B2 (500.1GB, SATA300, 3.5", 7200rpm, NCQ, 16MB Cache)
Optical Drive (H : N/A @ HL-DT-ST DVDRAM GH22NS50 (SATA150, DVD+-RW, CD-RW, 2MB Cache)
Optical Drive (I : N/A @ FAFULE L2ZSTEFGT (SCSI, BD-R, HD-DVD-R, DVD+-R-DL, CD-R)
Optical Drive (J : N/A @ FAFULE L2ZSTEFGT (SCSI, BD-R, HD-DVD-R, DVD+-R-DL, CD-R)

Peripherals
LPC Hub Controller 1 : ASUS LPC Interface Controller
LPC Legacy Controller 1 : T0 A5-13
Audio Device : ASUS HD Audio Controller
Audio Codec : VIA 0397h
Serial Port(s) : 1
Disk Controller : ASUS 6 port SATA AHCI Controller
Disk Controller : ASUS JMB368 IDE Controller
USB Controller 1 : ASUS USB UHCI Controller #4
USB Controller 2 : ASUS USB UHCI Controller #5
USB Controller 3 : ASUS USB UHCI Controller #6
USB Controller 4 : ASUS USB EHCI Controller #2
USB Controller 5 : ASUS USB UHCI Controller #1
USB Controller 6 : ASUS USB UHCI Controller #2
USB Controller 7 : ASUS USB UHCI Controller #3
USB Controller 8 : ASUS USB EHCI Controller #1
SMBus/i2c Controller 1 : Intel 801xx/63xx SMBus

Printers and Faxes
Printer : Microsoft XPS Document Writer (600x600, Colour)
Fax : Microsoft Shared Fax Driver (200x200)
Printer : Canon Inkjet MX300 series FAX (200x200, USB)
Printer : Canon Inkjet MX300 series (600x600, USB, Colour)

Network Services
Network Adapter : Realtek PCIe GBE Family Controller (Ethernet, 1Gbps)

Power Management
Mains (AC) Line Status : On-Line

Operating System
Windows System : Microsoft Windows 7 Ultimate 6.01.7600
Platform Compliance : x64

Windows Experience Index
Current System : 5.9