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Error 1402 while installing Virtual server 2005R2

Hi all
I am trying to install virutal server 2005R2 on an Xp professional machine fully updated.  I get this error while the installer reaches the registry keys area:
*****Error 1402, HKEY_Local_Machine\software\classes\Msxml2.DOMdocument.4.0\CLSID.  Verify that you have sufficient access to that key , or contact your support personnel*****
This is what I have done:
-I tried to install VSr2 by logging in as local administrator, no avail.
-I tried giving full access to that particular key in the registry to local administrator, system and myself.  No avail.
-I tried to give full rights to other keys which I do not remember through the posts on the web.  No avail.
Please help,  I need to install VS
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1 Solution
1. Try Running a registry cleaner, try finding all keys related to Virtual Server, and remove them www.jv16.org
2.  Go into Taskmanger, and stop all UnNecessary processes, Anti_Virus, Anti-Spyware...
3.  Try deleting the profile you are using to install it under, c:\documents and settings\PROFILE  <--- delete it, then log off, and log back on, let XP create a fresh profile

amanzoorNetwork infrastructure AdminAuthor Commented:
Thanks ricky
1.  I cleaned the registry as per your suggestion.  Reboot the system and tried installing the VS2005R2.  Same error message
2.I stopped antivirus and antispyware.  Tried to install, I got the same error message.
3.I deleted the profile, xp made a new on.  Tried to install VSR2.  I got the same error message.
Help plz
amanzoorNetwork infrastructure AdminAuthor Commented:
What if I delete Msxml2.DOMdocuments.4.0.  Where and how can i download it?
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amanzoorNetwork infrastructure AdminAuthor Commented:
Please guide:
By deleting Msxml2.DOMdocuments4.0 entry in registry and by reinstalling will my OS will be stable?
Also I searched for other entries which the installation of VS2005R2 has made it includes:
HKEY_LOCAL_MACHINE\SECURITY\Policy\Secrets\_SC_Virtual Server
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\Services\Virtual Server
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Virtual Server
Please guide what should I do with these entries?
Help plz
amanzoorNetwork infrastructure AdminAuthor Commented:
Who are finding a never ending loop like I did for the last one week:  

Following solution works if you are logged into a network on the machine on which you want to install VSr2 using a network user which is the administrator of the domain.
1)  Remove any user given the administrative rights on the local machine.
2)  Make sure only the administrator account is the only account for the local machine, on the local machine the domain account username and any account on the local machine should not have the same names.

3) Registry : at classes key HKEY_LOCAL_MACHINE\SOFTWARE\Classes  assign full rights to domain\username, domain\administrator and System (local)
4)Do not to restart machine after assigning full rights to the user mentioned above.  (If you restart the classes key for some reason assumes the original rights to all users only)
5) The best way is to make changes in the registry and install the vsr2 rightaway,  I used username@domain as the username and Domainname while the installation process asks for.
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