AVG Free won't install

Here is the error message:
Local machine: installation failed
Installation:
Error: Action failed for registry key HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows: creating registry key....
Error 0x80070005

I had previously removed McAfee using Revo Uninstaller. I obviously removed some vital registry keys that I shouldn't have. I restored the system to the point saved by Revo Uninstaller, but that didn't solve the problem.

I also can't use Windows Help and get the "can't find helpctr.exe" error message.

I have tried a couple of registry tools without success. So right now I have no antivirus or malware protection.

Can anyone help??

Thanks,
Ian

 

Thanks Mark,
I downloaded the removal tool and ran it twice with restarts x 2. Then ran CCleaner.
I still receive the same error message when attempting to install AVG Free.
Any further thoughts?
Thanks,
Ian

 

Go here http://freeforum.avg.com/read.php?12,146450,146450#msg-146450
Read BigAl's post on what to do to fix the error.
Probably method 2 is easier - using DialAFix

In fact, the person posted back that method 1 didn't work so just download DialAFix since it does work for getting rid of this error.

 

Thanks Plodr for your suggestions. However, after running dial a fix to reset permissions I remain unable to install AVG Free and obtain the same error message.

Incidentally, I tried to reinstall my Help and Support using dial a fix. That also was unsuccessful as it was unable to find a .cab file in my Service Pack Files. It asked for the XP Service Pack 3 CD which of course I do not have.

I feel that I need to reinstall SP3 to fix the registry errors, but that seems a daunting task.

Thanks Again
Ian

 

Thanks everyone for your help. I have abandoned attempting to install AVG free and have installed PC Tools Antivirus free. That seemed to go fine. If I can't fix the my "help and support" problem I will try a separate post for that.
Regards,
Ian.

 

Hi Mark,
Thanks for your input. I may give that a go. My concern was related to a warning an the Microsoft Update site about removing and reinstalling Updates in the precisely correct order. If it's as simple as uninstalling and then updating I would be willing to try that. Do you have any other caveats before I try that?
Regards,
Ian