Windows Installer Error, Access Denied

Error after trying to install something: "The Windows Installer service could not be accessed. This can occur if the windows Installer is not correctly installed. Contact your support personnel for assistance."

I can't even install ALL of my windows updates: Error 641 from windows updater.

I've had this problem for quite a few months now and just when I buy a game to play with my friends (DayZ) I try to install the software required to play the game and this thing just won't go away!

What I've tried for help:

Windows installer service error 1719

Can't install Scrolls "Windows Installer can't be accessed"*FIXED* - Support - Scrolls - Scrolls Fans Forums - Scrolls Fans

How to Fix "The Windows Installer service could not be accessed" Error - Help Desk Geek

"The Windows Installer service could not be accessed" error message when you try to install Office

"The Windows Installer Service Could Not Be Accessed" error message when you install a program in Windows XP

Error "The Windows Installer Service Could Not Be Accessed" when installing or updating programs on Windows 7 or Windows Vista

I would really appreciate it if someone could help me fix this problem and find a way to get rid of this(oh and yes my Windows 7 is legit

I've even done the Net Start run command - imgur: the simple image sharer - That is the error I get after trying to do it.

Code:

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

Validation Code: 0
Cached Online Validation Code: N/A, hr = 0xc004f012
Windows Product Key: *****-*****-GJY49-VJBQ7-HYRR2
Windows Product Key Hash: W5/6nm6F2UPXrCkY5xUhXb/+21g=
Windows Product ID: 00426-OEM-8992662-00006
Windows Product ID Type: 2
Windows License Type: OEM SLP
Windows OS version: 6.1.7600.2.00010100.0.0.001
ID: {DF5A138E-AF6F-400C-98CB-5696946518A5}(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_gdr.130318-1532
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: 100 Genuine
Microsoft Office Enterprise 2007 - 100 Genuine
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_E2AD56EA-765-d003_E2AD56EA-766-0_E2AD56EA-134-80004005

Browser Data-->
Proxy settings: N/A
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Win32)
Default Browser: C:\Program Files (x86)\Google\Chrome\Application\chrome.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-->
File Mismatch: C:\Windows\system32\wat\watadminsvc.exe[Hr = 0x80070003]
File Mismatch: C:\Windows\system32\wat\npwatweb.dll[Hr = 0x80070003]
File Mismatch: C:\Windows\system32\wat\watux.exe[Hr = 0x80070003]
File Mismatch: C:\Windows\system32\wat\watweb.dll[Hr = 0x80070003]
File Mismatch: C:\Windows\system32\slui.exe[6.1.7600.16385], Hr = 0x80092003

Other data-->
Office Details: <GenuineResults><MachineData><UGUID>{DF5A138E-AF6F-400C-98CB-5696946518A5}</UGUID><Version>1.9.0027.0</Version><OS>6.1.7600.2.00010100.0.0.001</OS><Architecture>x64</Architecture><PKey>*****-*****-*****-*****-HYRR2</PKey><PID>00426-OEM-8992662-00006</PID><PIDType>2</PIDType><SID>S-1-5-21-3060708838-2961956752-4002056223</SID><SYSTEM><Manufacturer>System manufacturer</Manufacturer><Model>System Product Name</Model></SYSTEM><BIOS><Manufacturer>American Megatrends Inc.</Manufacturer><Version>0501</Version><SMBIOSVersion major="2" minor="6"/><Date>20110509000000.000000+000</Date></BIOS><HWID>4FBA3607018400FE</HWID><UserLCID>0409</UserLCID><SystemLCID>0409</SystemLCID><TimeZone>AUS Eastern Standard Time(GMT+10:00)</TimeZone><iJoin>0</iJoin><SBID><stat>3</stat><msppid></msppid><name></name><model></model></SBID><OEM><OEMID>ACRSYS</OEMID><OEMTableID>ACRPRDCT</OEMTableID></OEM><GANotification/></MachineData><Software><Office><Result>100</Result><Products><Product GUID="{90120000-0030-0000-0000-0000000FF1CE}"><LegitResult>100</LegitResult><Name>Microsoft Office Enterprise 2007</Name><Ver>12</Ver><Val>70C7F96C82AD586</Val><Hash>S30ULyO45UgloVP4AEiIursPalM=</Hash><Pid>89388-707-1806497-65782</Pid><PidType>14</PidType></Product></Products><Applications><App Id="15" Version="12" Result="100"/><App Id="16" Version="12" Result="100"/><App Id="18" Version="12" Result="100"/><App Id="19" Version="12" Result="100"/><App Id="1A" Version="12" Result="100"/><App Id="1B" Version="12" Result="100"/><App Id="44" Version="12" Result="100"/><App Id="A1" Version="12" Result="100"/><App Id="BA" Version="12" Result="100"/></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: 00426-00178-926-600006-02-1033-7600.0000-0612012
Installation ID: 004854033644849785561453353473739140579904866133156970
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: HYRR2
License Status: Licensed
Remaining Windows rearm count: 3
Trusted time: 9/8/2013 11:15:53 PM

Windows Activation Technologies-->
HrOffline: 0x00000000
HrOnline: N/A
HealthStatus: 0x0000000000000000
Event Time Stamp: N/A
ActiveX: Not Registered - 0x80040154
Admin Service: Not Registered - 0x80040154
HealthStatus Bitmask Output:


HWID Data-->
HWID Hash Current: QgAAAAIABgABAAEAAAADAAAABQABAAEAln1OQ9YKdxZ86ayLGl14GVzZDqcWb57pYj284j2IYmSYLVY/9ipjZC5z

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            ALASKA        A M I
  FACP            ALASKA        A M I
  HPET            ALASKA        A M I
  MCFG            ALASKA        A M I
  SSDT            AMICPU        PROC
  SLIC            ACRSYS        ACRPRDCT

Here is what I've done for you, and I've also updated my profile for seven forums using the .exe provided and followed the instructions.