No BSOD but similar issues

Hello, I'm new to the forums but I've seen them around quite often.

I'm having a little problem with my Lenovo G560, comes with 4GB DDR3 and I've added another 4GB, in case that has anything to do with the problem.

My computer hangs sometimes and I have to manually restart it, there's no BSOD or anything. Just now, a few minutes ago, the Windows 7 theme changed color and my internet connection cut out, I had to disable and re-enable the interface for it to switch back to the original theme and start working again. I think it had something to do svchost but don't know why.

I will upload the output from the diagnostics tool you have on the forums.

It would be great if someone could elaborate on what you look for when reading the log files, I'm sure there are a few keywords to ctrl+f to that make the procedure a lot faster.

Thanks!
4c00h

Wasn't sure if to add this or not, but the application error in event viewer reported this at the time of the incident:

Code:

Faulting application name: svchost.exe_SysMain, version: 6.1.7600.16385, time stamp: 0x4a5bc3c1
Faulting module name: sysmain.dll, version: 6.1.7600.16385, time stamp: 0x4a5be07e
Exception code: 0xc0000005
Fault offset: 0x0000000000016d11
Faulting process id: 0x3b4
Faulting application start time: 0x01ce848d59fd52eb
Faulting application path: C:\Windows\System32\svchost.exe
Faulting module path: c:\windows\system32\sysmain.dll
Report Id: 274068dd-f17d-11e2-9936-b1d4fe89641b

Code:

Diagnostic Report (1.9.0027.0):
-----------------------------------------
Windows Validation Data-->

Validation Code: 0
Cached Online Validation Code: N/A, hr = 0xc004f012
Windows Product Key: *****-*****-V9488-FGM44-2C9T3
Windows Product Key Hash: rmk1OjF0iZq7gQoRmEcpnJHr0oc=
Windows Product ID: 00426-OEM-8992662-00010
Windows Product ID Type: 2
Windows License Type: OEM SLP
Windows OS version: 6.1.7600.2.00010100.0.0.001
ID: {67411843-4E27-40DD-B54E-54464193B529}(1)
Is Admin: Yes
TestCab: 0x0
LegitcheckControl ActiveX: N/A, hr = 0x80070002
Signed By: N/A, hr = 0x80070002
Product Name: Windows 7 Ultimate
Architecture: 0x00000009
Build lab: 7600.win7_rtm.090713-1255
TTS Error: 
Validation Diagnostic: 
Resolution Status: N/A

Vista WgaER Data-->
ThreatID(s): N/A, hr = 0x80070002
Version: N/A, hr = 0x80070002

Windows XP Notifications Data-->
Cached Result: N/A, hr = 0x80070002
File Exists: No
Version: N/A, hr = 0x80070002
WgaTray.exe Signed By: N/A, hr = 0x80070002
WgaLogon.dll Signed By: N/A, hr = 0x80070002

OGA Notifications Data-->
Cached Result: N/A, hr = 0x80070002
Version: N/A, hr = 0x80070002
OGAExec.exe Signed By: N/A, hr = 0x80070002
OGAAddin.dll Signed By: N/A, hr = 0x80070002

OGA Data-->
Office Status: 114 Blocked VLK 2
Microsoft Office Professional Edition 2003 - 114 Blocked VLK 2
OGA Version: N/A, 0x80070002
Signed By: N/A, hr = 0x80070002
Office Diagnostics: 025D1FF3-364-80041010_025D1FF3-229-80041010_025D1FF3-230-1_025D1FF3-517-80040154_025D1FF3-237-80040154_025D1FF3-238-2_025D1FF3-244-80070002_025D1FF3-258-3

Browser Data-->
Proxy settings: N/A
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Win32)
Default Browser: C:\Program Files\Internet Explorer\iexplore.exe
Download signed ActiveX controls: Prompt
Download unsigned ActiveX controls: Disabled
Run ActiveX controls and plug-ins: Allowed
Initialize and script ActiveX controls not marked as safe: Disabled
Allow scripting of Internet Explorer Webbrowser control: Disabled
Active scripting: Allowed
Script ActiveX controls marked as safe for scripting: Allowed

File Scan Data-->

Other data-->
Office Details: <GenuineResults><MachineData><UGUID>{67411843-4E27-40DD-B54E-54464193B529}</UGUID><Version>1.9.0027.0</Version><OS>6.1.7600.2.00010100.0.0.001</OS><Architecture>x64</Architecture><PKey>*****-*****-*****-*****-2C9T3</PKey><PID>00426-OEM-8992662-00010</PID><PIDType>2</PIDType><SID>S-1-5-21-690034042-1071100768-3458810064</SID><SYSTEM><Manufacturer>LENOVO</Manufacturer><Model>0679                            </Model></SYSTEM><BIOS><Manufacturer>LENOVO</Manufacturer><Version>29CN33WW(V2.10)</Version><SMBIOSVersion major="2" minor="6"/><Date>20101026000000.000000+000</Date></BIOS><HWID>C7B83607018400FC</HWID><UserLCID>0409</UserLCID><SystemLCID>0409</SystemLCID><TimeZone>Argentina Standard Time(GMT-03:00)</TimeZone><iJoin>0</iJoin><SBID><stat>3</stat><msppid></msppid><name></name><model></model></SBID><OEM><OEMID>HPQOEM</OEMID><OEMTableID>SLIC-WKS</OEMTableID></OEM><GANotification/></MachineData><Software><Office><Result>114</Result><Products><Product GUID="{90110C0A-6000-11D3-8CFE-0150048383C9}"><LegitResult>114</LegitResult><Name>Microsoft Office Professional Edition 2003</Name><Ver>11</Ver><Val>59D1605114E3500</Val><Hash>vfZmaSmFPIYrLWTcZSZErUQg+Fo=</Hash><Pid>73961-640-0000106-57171</Pid><PidType>14</PidType></Product></Products><Applications><App Id="15" Version="11" Result="114"/><App Id="16" Version="11" Result="114"/><App Id="18" Version="11" Result="114"/><App Id="19" Version="11" Result="114"/><App Id="1A" Version="11" Result="114"/><App Id="1B" Version="11" Result="114"/><App Id="44" Version="11" Result="114"/></Applications></Office></Software></GenuineResults>  

Spsys.log Content: 0x80070002

Licensing Data-->
Software licensing service version: 6.1.7600.16385

Name: Windows(R) 7, Ultimate edition
Description: Windows Operating System - Windows(R) 7, OEM_SLP channel
Activation ID: 7cfd4696-69a9-4af7-af36-ff3d12b6b6c8
Application ID: 55c92734-d682-4d71-983e-d6ec3f16059f
Extended PID: 00426-00178-926-600010-02-1033-7600.0000-1982013
Installation ID: 011693212914211855885392506650086691445270760935670823
Processor Certificate URL: http://go.microsoft.com/fwlink/?LinkID=88338
Machine Certificate URL: http://go.microsoft.com/fwlink/?LinkID=88339
Use License URL: http://go.microsoft.com/fwlink/?LinkID=88341
Product Key Certificate URL: http://go.microsoft.com/fwlink/?LinkID=88340
Partial Product Key: 2C9T3
License Status: Licensed
Remaining Windows rearm count: 3
Trusted time: 7/21/2013 7:39:57 AM

Windows Activation Technologies-->
HrOffline: 0x00000000
HrOnline: N/A
HealthStatus: 0x0000000000000000
Event Time Stamp: N/A
ActiveX: Registered, Version: 7.1.7600.16395
Admin Service: Not Registered - 0x80070005
HealthStatus Bitmask Output:


HWID Data-->
HWID Hash Current: KgAAAAEAAQABAAEAAAABAAAAAQABAAEAln3cTzaGmEGKTqwizMrc/lxd

OEM Activation 1.0 Data-->
N/A

OEM Activation 2.0 Data-->
BIOS valid for OA 2.0: yes
Windows marker version: 0x20001
OEMID and OEMTableID Consistent: yes
BIOS Information: 
  ACPI Table Name	OEMID Value	OEMTableID Value
  APIC			INTEL 		Calpella
  FACP			LENOVO		CB-01   
  HPET			LENOVO		CB-01   
  BOOT			INTEL 		Calpella
  MCFG			LENOVO		CB-01   
  WDRT			INTEL 		Calpella
  ASF!			INTEL 		Calpella
  SLIC			HPQOEM		SLIC-WKS
  ASPT			INTEL 		Calpella
  SSDT			PmRef		CpuPm
  SSDT			PmRef		CpuPm
  SSDT			PmRef		CpuPm

So what do I do next? Any ideas?