Random Freezes in Windows 7 ultimate 64bit

Your event log shows a lot of unexpected shutdowns and re-boots.

To ensure minidumps are enabled:

Go to Start, in the Search Box type: sysdm.cpl, press Enter.
Under the Advanced tab, click on the Startup and Recovery Settings... button.
Ensure that Automatically restart is unchecked.
Under the Write Debugging Information header select Small memory dump (256 kB) in the dropdown box (the 256kb varies).
Ensure that the Small Dump Directory is listed as %systemroot%\Minidump.
OK your way out.
Reboot if changes have been made.

Code:

 
Event[1013]:
  Log Name: System
  Source: EventLog
  Date: 2011-05-10T21:55:05.000
  Event ID: 6008
  Task: N/A
  Level: Error
  Opcode: N/A
  Keyword: Classic
  User: N/A
  User Name: N/A
  Computer: Oran-PC
  Description: 
The previous system shutdown at 21:52:12 on ý10/ý05/ý2011 was unexpected.
 
Event[1014]:
  Log Name: System
  Source: Microsoft-Windows-Kernel-Power
  Date: 2011-05-10T21:54:58.814
  Event ID: 41
  Task: N/A
  Level: Critical
  Opcode: Info
  Keyword: N/A
  User: S-1-5-18
  User Name: NT AUTHORITY\SYSTEM
  Computer: Oran-PC
  Description: 
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
 
Event[364]:
  Log Name: System
  Source: VDS Basic Provider
  Date: 2011-05-12T17:37:44.000
  Event ID: 1
  Task: N/A
  Level: Error
  Opcode: N/A
  Keyword: Classic
  User: N/A
  User Name: N/A
  Computer: Oran-PC
  Description: 
Unexpected failure. Error code: D@01010004
 
Event[3424]:
  Log Name: System
  Source: Disk
  Date: 2011-05-06T10:40:28.800
  Event ID: 11
  Task: N/A
  Level: Error
  Opcode: N/A
  Keyword: Classic
  User: N/A
  User Name: N/A
  Computer: Oran-PC
  Description: 
The driver detected a controller error on \Device\Harddisk1\DR2.
 
Event[3435]:
  Log Name: System
  Source: cdrom
  Date: 2011-05-06T10:40:26.243
  Event ID: 7
  Task: N/A
  Level: Error
  Opcode: N/A
  Keyword: Classic
  User: N/A
  User Name: N/A
  Computer: Oran-PC
  Description: 
The device, \Device\CdRom0, has a bad block.
 
Event[10672]:
  Log Name: System
  Source: Service Control Manager
  Date: 2011-04-20T09:48:45.684
  Event ID: 7026
  Task: N/A
  Level: Error
  Opcode: N/A
  Keyword: Classic
  User: N/A
  User Name: N/A
  Computer: Oran-PC
  Description: 
The following boot-start or system-start driver(s) failed to load: 
AFD
AppleCharger
CSC
DfsC
discache
ehdrv
LUMDriver
NetBIOS
NetBT
nsiproxy
Psched
rdbss
SCDEmu
spldr
tdx
Wanarpv6
WfpLwf
 
Event[10681]:
  Log Name: System
  Source: Service Control Manager
  Date: 2011-04-20T09:48:44.078
  Event ID: 7001
  Task: N/A
  Level: Error
  Opcode: N/A
  Keyword: Classic
  User: N/A
  User Name: N/A
  Computer: Oran-PC
  Description: 
The Network Store Interface Service service depends on the NSI proxy service driver. service which failed to start because of the following error: 
A device attached to the system is not functioning.
 
Event[11164]:
  Log Name: System
  Source: BTHUSB
  Date: 2011-04-19T12:13:41.587
  Event ID: 17
  Task: N/A
  Level: Error
  Opcode: N/A
  Keyword: Classic
  User: N/A
  User Name: N/A
  Computer: Oran-PC
  Description: 
The local Bluetooth adapter has failed in an undetermined manner and will not be used. The driver has been unloaded.

You either had a bad CD/DVD or possibly a bad CD/DVD drive.

Also your Bluetooth adapter has failed.

Windows memory tester is not very reliable.
Down load and run memtest86+, run the first test with all RAM cards installed.
RAM - Test with Memtest86+

Post test results and any minidump files you get..

From my experience, anything is possible.

With more than 4GB RAM, 2GB or larger RAM cards, you will likely need a memory controller voltage bump.
Since you have 8GB RAM, 2X4GB cards, this needs to be addressed.
With some information we can make some adjustments.


Can you download CPUZ and post a snip of the CPU, Mainboard, Memory, and SPD tabs.
For posting the information , enter 'Snipping tool' in the Start button > Search box, hit enter. Select the area you want to post and save to a convenient place.
How to Post a Screenshot in Seven Forums

Have you been checking your temperatures?
Use Real Temp , to check the CPU temps when at idle, under load and/or testing.
Let us know the minimum and maximum temps you get.

Go to your BIOS and tell us what the CPU, RAM and the CPU integrated memory controller voltages are.

Can you use this tutorial to post the CPUZ info, this way everyone can see it.

How to Post a Screenshot in Seven Forums

Try d/l a new version of CPUZ 1.57.
The new CPU/motherboard may not be updated on that version.

If that doesn't work then d/l Speccy Free System information Utility.

The QPI/VTT Voltage is the integrated memory controller, bump the voltage to 1.10v.
Test for stability with both RAM cards installed.

Post the CPUZ 1.57 Memory and SPD tabs.

Yes, bump the QPI/VTT Voltage to 1.10v.


CPU - Stress Test with Prime95
Run the Prime95 Torture test for 4hours, if it has errors you can stop the test. If it stops on it's own that's an error.

First open Real Temp to monitor CPU temperatures, don't go over 77°C.
Open Prime95 and stop the test if it is running, in Advanced tab select 'Round off checking', in the Options tab select 'Torture Test...', in the window that opens select 'Blend', after 'Number of torture test threads to run' enter 4, then click OK to start the test.

Intel® Core™ i5-2500 Processor specs