Lag and spike sometimes

Hello all:),
my laptop lag and spike sometime, i don't know what thing cause that,
my cpu usage is not high and memory too, im so confuse.
I'm use this laptop for study only, it make me so hard to type words,
please help me, below my detail!

latencymon log:

____________________________________________________________________________________________________ _____
CONCLUSION
____________________________________________________________________________________________________ _____
Your system appears to be having trouble handling real-time audio and other tasks. You are likely to experience buffer underruns appearing as drop outs, clicks or pops. One or more DPC routines that belong to a driver running in your system appear to be executing for too long. At least one detected problem appears to be network related. In case you are using a WLAN adapter, try disabling it to get better results. One problem may be related to power management, disable CPU throttling settings in Control Panel and BIOS setup. Check for BIOS updates.
LatencyMon has been analyzing your system for 0:04:01 (h:mm:ss) on all processors.


____________________________________________________________________________________________________ _____
SYSTEM INFORMATION
____________________________________________________________________________________________________ _____
Computer name: ANONYMOUS
OS version: Windows 7 Service Pack 1, 6.1, build: 7601 (x64)
Hardware: Satellite L745, TOSHIBA, Intel Corp., Base Board Product Name
CPU: GenuineIntel Intel(R) Core(TM) i5-2450M CPU @ 2.50GHz
Logical processors: 4
Processor groups: 1
RAM: 5101 MB total


____________________________________________________________________________________________________ _____
CPU SPEED
____________________________________________________________________________________________________ _____
Reported CPU speed: 2494.0 MHz
Measured CPU speed: 529.0 MHz (approx.)

Note: reported execution times may be calculated based on a fixed reported CPU speed. Disable variable speed settings like Intel Speed Step and AMD Cool N Quiet in the BIOS setup for more accurate results.


____________________________________________________________________________________________________ _____
MEASURED INTERRUPT TO USER PROCESS LATENCIES
____________________________________________________________________________________________________ _____
The interrupt to process latency reflects the measured interval that a usermode process needed to respond to a hardware request from the moment the interrupt service routine started execution. This includes the scheduling and execution of a DPC routine, the signaling of an event and the waking up of a usermode thread from an idle wait state in response to that event.

Highest measured interrupt to process latency (µs): 4642.194295
Average measured interrupt to process latency (µs): 15.145728

Highest measured interrupt to DPC latency (µs): 4544.079293
Average measured interrupt to DPC latency (µs): 7.031178


____________________________________________________________________________________________________ _____
REPORTED ISRs
____________________________________________________________________________________________________ _____
Interrupt service routines are routines installed by the OS and device drivers that execute in response to a hardware interrupt signal.

Highest ISR routine execution time (µs): 127.139936
Driver with highest ISR routine execution time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation

Highest reported total ISR routine time (%): 0.112436
Driver with highest ISR total time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation

Total time spent in ISRs (%) 0.209475

ISR count (execution time <250 µs): 125587
ISR count (execution time 250-500 µs): 0
ISR count (execution time 500-999 µs): 0
ISR count (execution time 1000-1999 µs): 0
ISR count (execution time 2000-3999 µs): 0
ISR count (execution time >=4000 µs): 0


____________________________________________________________________________________________________ _____
REPORTED DPCs
____________________________________________________________________________________________________ _____
DPC routines are part of the interrupt servicing dispatch mechanism and disable the possibility for a process to utilize the CPU while it is interrupted until the DPC has finished execution.

Highest DPC routine execution time (µs): 5644.065758
Driver with highest DPC routine execution time: ndis.sys - NDIS 6.20 driver, Microsoft Corporation

Highest reported total DPC routine time (%): 0.156569
Driver with highest DPC total execution time: ndis.sys - NDIS 6.20 driver, Microsoft Corporation

Total time spent in DPCs (%) 0.506596

DPC count (execution time <250 µs): 209036
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 2617
DPC count (execution time 1000-1999 µs): 0
DPC count (execution time 2000-3999 µs): 0
DPC count (execution time >=4000 µs): 0


____________________________________________________________________________________________________ _____
REPORTED HARD PAGEFAULTS
____________________________________________________________________________________________________ _____
Hard pagefaults are events that get triggered by making use of virtual memory that is not resident in RAM but backed by a memory mapped file on disk. The process of resolving the hard pagefault requires reading in the memory from disk while the process is interrupted and blocked from execution.

NOTE: some processes were hit by hard pagefaults. If these were programs producing audio, they are likely to interrupt the audio stream resulting in dropouts, clicks and pops. Check the Processes tab to see which programs were hit.

Process with highest pagefault count: avp.exe

Total number of hard pagefaults 451
Hard pagefault count of hardest hit process: 431
Highest hard pagefault resolution time (µs): 3949925.020048
Total time spent in hard pagefaults (%): 2.419362
Number of processes hit: 5


____________________________________________________________________________________________________ _____
PER CPU DATA
____________________________________________________________________________________________________ _____
CPU 0 Interrupt cycle time (s): 7.602945
CPU 0 ISR highest execution time (µs): 127.139936
CPU 0 ISR total execution time (s): 2.019778
CPU 0 ISR count: 125587
CPU 0 DPC highest execution time (µs): 5644.065758
CPU 0 DPC total execution time (s): 4.777348
CPU 0 DPC count: 209175
____________________________________________________________________________________________________ _____
CPU 1 Interrupt cycle time (s): 0.283307
CPU 1 ISR highest execution time (µs): 0.0
CPU 1 ISR total execution time (s): 0.0
CPU 1 ISR count: 0
CPU 1 DPC highest execution time (µs): 138.632719
CPU 1 DPC total execution time (s): 0.005053
CPU 1 DPC count: 661
____________________________________________________________________________________________________ _____
CPU 2 Interrupt cycle time (s): 0.692165
CPU 2 ISR highest execution time (µs): 0.0
CPU 2 ISR total execution time (s): 0.0
CPU 2 ISR count: 0
CPU 2 DPC highest execution time (µs): 4571.561748
CPU 2 DPC total execution time (s): 0.102241
CPU 2 DPC count: 1895
____________________________________________________________________________________________________ _____
CPU 3 Interrupt cycle time (s): 0.445675
CPU 3 ISR highest execution time (µs): 0.0
CPU 3 ISR total execution time (s): 0.0
CPU 3 ISR count: 0
CPU 3 DPC highest execution time (µs): 0.0
CPU 3 DPC total execution time (s): 0.0
CPU 3 DPC count: 0
____________________________________________________________________________________________________ _____

If you need more detail or any information,i will post it