Garbled screen, blue screens and freezes error when using PC.

It did indeed, sorry for the late reply.

Here are a couple of things I've picked up on, I'll advise here mostly on experience. Firstly BitDefender is causing problems, it's been known to have caused many issues in the past including BSODs.

Code:

Event[57418]:
  Log Name: System
  Source: Application Popup
  Date: 2015-07-09T15:54:54.000
  Event ID: 26
  Task: N/A
  Level: Information
  Opcode: N/A
  Keyword: Classic
  User: N/A
  User Name: N/A
  Computer: Hal2
  Description: 
Application  popup: vsserv.exe - Application Error : The exception unknown software  exception (0xe06d7363) occurred in the application at location  0x7562812f.


Event[57419]:
  Log Name: System
  Source: Service Control Manager
  Date: 2015-07-09T15:54:57.196
  Event ID: 7034
  Task: N/A
  Level: Error
  Opcode: N/A
  Keyword: Classic
  User: N/A
  User Name: N/A
  Computer: Hal2
  Description: 
The Bitdefender Virus Shield service terminated unexpectedly.  It has done this 1 time(s).

Event[57418]:
  Log Name: System
  Source: Application Popup
  Date: 2015-07-09T15:54:54.000
  Event ID: 26
  Task: N/A
  Level: Information
  Opcode: N/A
  Keyword: Classic
  User: N/A
  User Name: N/A
  Computer: Hal2
  Description: 
Application popup: vsserv.exe - Application Error : The exception unknown software exception (0xe06d7363) occurred in the application at location 0x7562812f.


Event[57419]:
  Log Name: System
  Source: Service Control Manager
  Date: 2015-07-09T15:54:57.196
  Event ID: 7034
  Task: N/A
  Level: Error
  Opcode: N/A
  Keyword: Classic
  User: N/A
  User Name: N/A
  Computer: Hal2
  Description: 
The Bitdefender Virus Shield service terminated unexpectedly.  It has done this 1 time(s).

My advice here would be to uninstall BitDefender and Install MS Security Essentials and MalwareBytes.

   Note

Make sure you uncheck the 'Enable Free Trial' box when installing.

This is possibly connected to the broken USB port.

Code:

Event[57350]:
  Log Name: System
  Source: Microsoft-Windows-Kernel-PnP
  Date: 2015-07-09T09:43:02.868
  Event ID: 219
  Task: N/A
  Level: Warning
  Opcode: Info
  Keyword: N/A
  User: S-1-5-18
  User Name: NT AUTHORITY\SYSTEM
  Computer: Hal2
  Description: 
The driver \Driver\WUDFRd failed to load for the device WpdBusEnumRoot\UMB\2&37c186b&0&STORAGE#VOLUME#_??_USBSTOR#DISK&VEN_GENERIC-&PROD_COMPACT_FLASH&REV_1.00#20021111153705700&0#.

How happy would you be opening the case and disconnecting that USB port? If it's shorting it could be causing issues.

Stop using torrent programs.

Code:

Event[56301]:
  Log Name: System
  Source: Microsoft-Windows-DNS-Client
  Date: 2015-07-06T15:41:31.848
  Event ID: 1014
  Task: N/A
  Level: Warning
  Opcode: Info
  Keyword: N/A
  User: S-1-5-20
  User Name: NT AUTHORITY\NETWORK SERVICE
  Computer: Hal2
  Description: 
Name resolution for the name i-38.b-40299.bt.bench.utorrent.com timed out after none of the configured DNS servers responded.

Event[56306]:
  Log Name: System
  Source: Microsoft-Windows-DNS-Client
  Date: 2015-07-06T15:41:39.161
  Event ID: 1014
  Task: N/A
  Level: Warning
  Opcode: Info
  Keyword: N/A
  User: S-1-5-20
  User Name: NT AUTHORITY\NETWORK SERVICE
  Computer: Hal2
  Description: 
Name resolution for the name update.bittorrent.com timed out after none of the configured DNS servers responded.

The issues may not be fixed but the above will eliminate a lot of potential causes. Keep us posted.