High Disk Usage (PC keeps freezzing)

High Disk Usage (PC keeps freezzing)

OS: Microsoft Windows 7 Ultimate 64-bit
Well I don't know when this really happens but this 2 process make the PC stop working and once I look at the HDD light it looks like HDD is working none stop.
When I try to press Ctrl+Alt+Delete the screen takes long time to show up, if even it shows up.
Once I managed to get starting the shut down process it takes forever to shut down, and most time I have to hold the power button to turn off the PC and the odd thing is that if the shut down is really slow and the shut down process is completes then PC will boot up really slow.
How do I know this because I have turned off the boot GUI so I can see the list of the drivers while loading, normal times (when PC didn't friezed/slowed down) or the times when I hold the power button to turn off then on the boot up list of drivers will load very fast as you can't see the lines, but if I let the PC shut down normally (while everything slowed down) once I try to boot up it runs really slow each line takes like really slow then I have to run the PC in repair mode then in the scan won't show any problem but once the scan is done it will boot fast. I don't get any error code or some thing.
Category: Performance Alert
Date & Time,Risk,Activity,Status,Recommended Action
6/7/2013 1:15:00 AM,Info,High Disk Write usage by: Windows Explorer ,Detected,No Action Required
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Filename: explorer.exe
Full Path: c:\windows\winsxs\amd64_microsoft-windows-explorer_31bf3856ad364e35_6.1.7601.17567_none_afa79dc39081d0ba\explorer.exe
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Details
Reliable,  Many Users,  Mature,  Trusted

Origin
Downloaded from Unknown

Activity
Actions performed: Suspicious actions performed: None
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Developers Microsoft Corporation
Version 6.1.7601.17567
Identified 10/3/2011 at 11:01:59 PM
Last Used Not Available
Startup Item No
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Reliable
With typical use this program crashes very infrequently.

Many Users
Millions of users in the Norton Community have used this file.

Mature
This file was released more than 31 days 2 years 2 months ago.

Trusted
Norton has given this file a trusted rating.
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Source File:
explorer.exe
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Performance
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Avg. Resource Usage: Moderate
Avg. CPU Usage: Low
Avg. Memory Usage: Moderate
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Performance Alert

Process ID
1952

CPU
Normal

Memory
Normal

Handles Count
Normal

Disk Read Activity
Normal

Disk Write Activity
 371 MB (total for this process).
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File Thumbprint - SHA:
6bed1a3a956a859ef4420feb2466c040800eaf01ef53214ef9dab53aeff1cff0
File Thumbprint - MD5:
332feab1435662fc6c672e25beb37be3

**==================================================================================**

Category: Performance Alert
Date & Time,Risk,Activity,Status,Recommended Action
6/7/2013 12:24:58 AM,Info,High Disk Write usage by: Host Process for Windows Services ,Detected,No Action Required
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Filename: svchost.exe
Full Path: c:\windows\system32\svchost.exe
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Details
Reliable,  Many Users,  Mature,